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User Manual VM700T Video Measurement Set Option 21 Camera

1. Main Menu Average Rescale Shading Display Acquire amp Camera ID Record Num EHE Comp Charts Data 1 to 256 Text entry keyboard Shading Comp Submenu Store 1 Store 2 Remove 1 Remove 2 Pass to Shading Shading Shading Shading Shading Clrimetry Fi Display Submenu Waveform Box Fit Graticule Source Parade Overlay Ref Channels Channels 0 45 to 3 00 Source Source Source Display A B C Acquire amp Charts Submenu S pecial Linear Log Block Block Position Chart Chart Mode Step H 2 to 263 Manual Ist Step Last Step Measure Exit Steps Sec 44 uSec Cycles 3 to 12 0 9t079 5 0 9to 79 5 1 to 20 Figure 2 18 Gamma menu tree Main Menu Average Num 32 2 38 Average Num specifies the weighting factor to be used for averaging The Average Num range is 1 to 256 The default value is 32 To change the Average Num value touch the Average Num soft key to highlight it rotate the knob until the desired weighting factor appears then press the Average Num soft key again VM700T Option 21 Camera Measurements User Manual Operating Basics Rescale Shading Comp Display Acquire amp Charts Camera ID Record Data Rescale restores the display to i
2. ALY Au Y AV where AL L nas L ref Au Umeas U ref Av Vineas Vref Hue difference This is a distance in CIELUV space that represents the difference between the hues of two colors This is a chromatic difference only This value is computed by means of the following formula AH 2C C 1 cosAh where Cr JA nea AV mea C Jw vu Ah Mneas Href VM700T Option 21 Camera Measurements User Manual Operating Basics RMS values for AE and AH the overall quality of the colors on the chart are also displayed A plot of u versus v appears on the left half of the screen see Figure 2 3 The measured position of the selected color is shown by a solid box on this plot An open box represents the reference position for the color The position of white is also shown as a small circle marked with a W For ease of interpretation the positions of green red and blue are also shown on the display and form a triangle on the screen Figure 2 3 shows the Colorimetry display in Continuous Acquisition mode In this mode you may make on camera adjustments while monitoring measured results Up to six colors may be monitored continuously The display contains three graphs that show color patch lightness hue and measured error Colorimetry NTSC Sync Ext L u v Graph Camera Camera 1 NTSC P Macbeth chart 50 0 Default Ref 40 0 30 0 3100K Studio SMPTE Phosphors
3. Space shift Figure 1 3 File naming keyboard m When the VM700T is in remote mode the return character becomes a tilde character for purposes of file name reference Thus a directory name that is displayed as JOHN SMITH in the directory display becomes JOHN SMITH in a remote operation 4 Touch the Done soft key when you have named the file The new file containing the Component Measurement limits from the file you selected as the template can be edited If you do not want to create the new file touch the Cancel key to quit the process Table 1 1 shows the editable choices in a user created Camera Testing measure ments limit file To change a Camera Testing parameter use the following procedure 1 Rotate the knob to highlight the line containing the parameter to change This includes the title line in the configuration file Use a descriptive file name for help in identifying it later 2 Select the parameter you want to change by touching it 3 Rotate the knob to increase or decrease the parameter value 4 Touchthe Accept Input soft key to accept the change VM700T Option 21 Camera Measurements User Manual Configuring the Camera Option Table 1 1 Editable Fields in the Camera Testing File Editable Item System Camera Testing Option Configuration defaults Choices Name of file identification line can be changed for the measurement reports This does not change the file nam
4. Largest Defect 4 Pixels Max Dev Found 27 4 mv at F1 L 110 19 06 uSec 71 Pixels Over Threshold Pixels Change Rescale Threshold H Density Meas Camera ID Record Display 7 mv 768 Pxls Parameter Data Figure 2 6 Defects Measurement bar graph display Pressing the Menu button when the Defects measurement is running brings up the Defects main menu The Defects menu tree is shown in Figure 2 7 Main Menu Change Rescale Threshold H Density Meas Camera ID Record Display HH TRHHEP xls Parameter Data 1to 100 1 to 9999 Meas Parameters Submenu Text entry keyboard n Frames Remove Correc 20 0 C Averaged Shading Threshold HEEF 99 9 to 99 9 Deg C Figure 2 7 Defects menu tree VM700T Option 21 Camera Measurements User Manual Operating Basics Main Menu Change Display Rescale Threshold at 10 mV H Density 700 Pxls Change Display toggles the display between a bar graph and a monitor with a one line waveform Rescale restores the display to its default scale Threshold specifies the minimum amplitude deviation to search for as a defect To change the threshold turn the knob while touching the soft key H Density nnn Pxls specifies the number of cells in each line of the CCD device under test To change the number of cells turn the knob while touching the soft key NOTE If H Den
5. NOTE The Configure Function and Measure buttons cannot be selected from remote VM700T Option 21 Camera Measurements User Manual 3 3 Remote Commands and Keywords set keyword channel letter value valued show filename softkey softkey name 34 The set command defines the configuration values to be used during the remote session The keywords available to use with set are listed in Table 3 3 and Table 3 4 on page 3 7 The channel_letter can be A B or C The configuration values changed with set remain in effect until they are restored to their original pre remote values with the restoreconfig command or the VM700T is turned off and back on again Note that the system line and other global variables can be changed with set but are not restored with the restoreconfig command Example VM700T gt set YGDR A 0 600 The above example changes the PAL GDR reference voltage error limits for channel A from their previous values to 0 lower limit to 600 upper limit mV The show command returns the contents of the specified filename The default path is the Measurement Results directory but other files can be specified with a full pathname or a path relative to the Measurement Results directory Example VM700T gt show nvram0 ConfigFiles Source Selection Video Video NTSC Video Source File Name PAL Video Source File Name Source A NTSC System Default System Default Source B PAL System Default System De
6. or clock crosstalk Background FPN also increases with temperature Fixed Pattern Noise Setup In setting up to make a Fixed Pattern Noise measurement check the following m The source selection hard keys are used to select and measure each channel separately The application accepts GBR color difference YPbPr composite video but does not distinguish between the different formats m Use the VM700T Waveform application to set the average voltage level of the signal with the camera pointed at an evenly illuminated white field The camera should be defocused so that any possible uneven lighting effects will not be picked up For NTSC measurements for the while field set the average voltage level to 50 IRE For PAL measurements set the average voltage level to 350 mV With the camera lens capped black check that the voltage level is above black clip NOTE Make this measurement twice once for black camera lens capped and once for white camera camera pointed at an evenly illuminated white field Fixed Pattern The Fixed Pattern Noise measurement produces three added displays the Noise Display Histogram display the Spectrum display and the Expanded Picture display The Waveform display and the regular monitor display are also available Figure 2 10 shows the Fixed Pattern Noise histogram display VM700T Option 21 Camera Measurements User Manual 2 23 Operating Basics 2 24 The RMS noise level is always shown in t
7. 1 4 to 64 or f nn n the setting may be left undefined Smr Iris Smr Iris f nn n sets the smear iris f stop Range is 1 4 to 64 f nn n or the setting may be left undefined Field Field Toggle displayed when the Select Line hardkey is Toggle pressed This soft key toggles the display between field 1 and field 2 Default Default Line displayed when the Select Line hardkey is Line pressed Selects the line specified as the default at 2 54 configuration VM700T Option 21 Camera Measurements User Manual CA game Remote Commands and Keywords AE AAA Remote Commands and Keywords Like other VM700T Video Measurement Set functions remote control of Camera measurement functions is performed via the serial RS 232C or parallel GPIB option 48 ports on the VM 700T rear panel Using the remote control functions requires that you connect a terminal or computer to the VM700T via the RS 232C port with a correctly wired interconnect cable If you use a computer you will also need a suitable VM700 terminal program such as the Tektronix application VMT for serial communication VMT offers a choice of either menu selection or command line entry of VM700T remote commands For GPIB communications you will need a GPIB controller and appropriate controller programming For information about configuring the VM 700T serial ports for remote opera tion see the VM 700T RS 232 Interface Programmer Manual The programmer manual discusses the VM 700T
8. 2 0dB Ref Store Reference Reference Packet Reference 1 to 12 Store Reference Submenu Store 1 Store 2 Show 1 Show 2 Previous Reference Reference Reference Reference enu Acquire Submenu Special Block Block Position Average Lines 2 to 32 Special Position Submenu Set Width Packet Center Exit Default Default HH Default 1 to 12 1 If you use a frequency response chart that has no frequency packets outside the 6 MHz BW of the VM700T aliasing does not occur You may eliminate the Aliasing measurement by defining out of bandwidth packets in the reverse order for example 9 to 8 for the packets beyond the 6 MHz BW of the VM700A In this case Aliasing becomes invalid and that soft key choice in the Frequency Response measurement menu will not be displayed If Aliasing is the selected choice when the packets are redefined to eliminate the Aliasing measurement the Frequency Response measurement defaults to Depth of Modulation Figure 2 16 Frequency Response menu tree 2 32 VM700T Option 21 Camera Measurements User Manual Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com Operating Basics Main Menu Average Average nn Frames specifies the number of frames used to Frames 32 average in making the measurement The averaging range is 2 to 32 To change the averaging value touch the Average Frames soft key to highlight it rotate the knob until the desired
9. 20 0 Gamma 0 44 0 46 0 45 10 0 32 gt 32 24 0 0 Average 10 0 20 0 30 0 40 0 50 0 100 0 0 0 100 0 Blue Green Red Yellow Magenta Cyan 4 0 2 0 0 0 2 0 4 0 PIT 40 0 L Difference DE Average Rescale Reference Meas Acquire Camera ID Record Num 32 Condition Charts Data Figure 2 3 Colorimetry measurement display in continuous acquisition mode VM700T Option 21 Camera Measurements User Manual 2 7 Operating Basics Colorimetry Menu Pressing the Menu button when the Colorimetry measurement is running brings up the Colorimetry main menu The Colorimetry menu tree is shown in Figure 2 4 Main Menu Average Rescale Reference Meas Acquire Camera ID Record Num Condition amp Charts Data Reference Submenu Text entry keyboard Store Relative ae Reference to Ref Store 1 Store 2 Store 3 Store 4 Store 5 Store 6 Relative Reference Reference Reference Reference Reference Reference to Ref Use 1 Use 2
10. 8 Continual Acq 2 12 Correct Threshold 2 20 Cursor 2 46 Cursor soft key 2 44 Custom Chart 2 12 2 46 Custom Illum 2 11 Custom illuminant light source 1 5 Custom Phosphor 1 5 2 11 D dB Ref 2 33 Default Line 2 41 2 54 Index 1 Index Default Reference 2 10 Defect Clusters 2 18 defective cells 2 16 Defects 2 16 2 19 bar graph display 2 18 display 2 17 menus 2 18 2 19 setup 2 16 delta H 2 6 Depth of Modulation DOM 2 28 2 34 Detail description 2 20 setup 2 20 Detail menu 2 22 Display 2 39 Done soft key 1 4 E E 2 6 EBU Phosphor 2 11 Exit 2 35 2 41 2 54 Expanded Picture 2 27 F Field Toggle 2 13 2 41 2 54 files Camera Testing 1 1 1 3 rules for naming 1 3 Source Selection Video 1 1 System Default 1 1 template 1 2 Video Source 1 1 Filters Selection 2 27 Fit 2 40 Fixed Pattern Noise 2 23 2 28 display 2 23 2 26 menus 2 26 2 28 setup 2 23 Frame Chart 2 45 Frequency Response 2 35 chart 2 28 display 2 30 2 31 line 1 5 menus 2 32 2 35 packets 1 5 results 1 5 setup 2 29 Front panel button names 3 3 Fsc Trap Filter 2 27 Index 2 Full Graticule 2 47 G Gamma 2 10 correction 2 5 description 2 35 setup 2 36 Geometry and Registration connections 2 42 description 2 41 setup 2 42 Geometry Ch A 2 46 Graticule 2 45 Graticule Ref nn n 2 40 H h 2 6 H Density nnn Pxls 2 19 High Pass 100 kHz 2 27
11. Camera Camera 1 NTSC mV Line Rate Display mV Field Rate Display 25 20 15 10 5 0 5 Fl L 22 F2 L 262 uSec Line Ave Video Level 10 2 mv V Shading 0 8 H Shading Averaged 1 4 H Shading F1 L 137 1 3 Average 16 Stored Data Max H Sh F1 L 65 2 0 al Rees bM ied Max al fee ID Ee al Frames bM ied Lines Ee Figure 2 22 The Shading application display VM700T Option 21 Camera Measurements User Manual Operating Basics Shading Menu Pressing the Menu button when the Shading application is running displays the Shading main menu The Shading menu tree is shown in Figure 2 23 Main Menu Average Rescale Median 1 Show Max 1 Acquire Camera ID Record Frames Filter n Lines Data 2 to 32 Special Text entry Position keyboard 1 Appears when sync pulse is applied but only after averaging function finishes Figure 2 23 The Shading menu tree Main Menu Average nn Frames Rescale Median Filter Show Max Lines Acquire Average nn Frames selects the number of frames to average in performing the measurement the range is 2 to 32 To change the Average Frames value touch the Average Frames soft key to highlight it rotate the knob until the desired number of frames appears then press the Average Frames soft key again Rescale resizes the display to the graticule Median Filter uses a median filter to re
12. Camera Measurements User Manual 3 1 Remote Commands and Keywords Camera Measurement Remote Commands execute application The VM700T remote control commands use this form command argument s Variable values in the command are shown in italic Optional arguments are enclosed with A discussion of command usage and arguments follows the command header Note that VM700 gt is a prompt which you can change not an input The execute command starts the specified VM 700T application An application is one of the executable files with exceptions noted below found in the Instrument Operations VM 700 Diagnostics Video Measurements Audio Measurements or Video Options directories in the Executable Files directory Selecting an operational mode application such as Vector is equiva lent to pressing the front panel button the LED on the selected button is turned on Selecting a measurement or diagnostic application is equivalent to touching the desired soft key Example VM700T gt execute Colorimetry You can run these Camera Testing measurement applications under remote control Be sure to use the same capitalization and tildes as shown in the following Colorimetry Defects Detail Fixed_Pattern Noise Frequency Response Gamma Geometry Registration Shading Vertical Smear get keyword channel letter The get command returns the configuration file value specified by keyword on the channel specified by
13. Option configuration file Then make sure that the Source Selection Video file points to the correct Video Source File Refer to Configuring the Camera Option beginning on page 1 1 for information about setting up these files VM700T Option 21 Camera Measurements User Manual 2 29 Operating Basics m Use the VM700T Waveform application to set the average voltage level of the signal with the camera pointed at an evenly illuminated white field The camera should be defocused so that any possible light blemish is not picked up For NTSC measurements for the white field set the average voltage level to 50 IRE For PAL measurements set the average voltage level to 350 mV With the camera lens capped black check that the voltage level is above the black clip NOTE We recommend that this measurement be made twice once for black camera lens capped and once for white camera camera pointed at an evenly illuminated white field Frequency Figure 2 14 shows the Frequency Response Measurement display when the Response Display camera is outputting GBR signals Figure 2 15 shows the Frequency Response Measurement display when the camera is outputting YPbPr signals The screen shows amplitude versus packet number for each of the G B and R channels in GBR systems or for the Y channel in YPbPr signals Frequency Response Sync Ext Depth of Modulation Field 2 Line 115 Synchronous Camera Studio NTSC Camera Amplitude 0 dB 4
14. VM700T what gamma correction the camera uses To do so press the Menu button to display the Colorimetry menu Press the Gamma soft key then press the soft key corresponding to the appropriate gamma correction Linear Gamma means the camera is performing no gamma correction Nominal CCIR 709 means the camera is applying a camera correction factor of 0 45 Measured Gamma means the gamma measured and stored by the Gamma application Colorimetry Display Figure 2 2 shows a typical Colorimetry display in Color Measurement mode acquisition is not continuous This display contains a list of colors whose names appear at the right side of the display You can use the knob to scroll through this list of colors As you scroll through the list the parameters measured for the currently highlighted color appear on the screen to the right of center Colorimetry NTSC Sync Ext CIE 1976 Chroma Camera Camera 1 NTSC F1 o o o O O O O O O O OQO 0 05 0 00 607 557 50 45 40 357 30 257 20 15 10 Macbeth Chart Default Ref Srl wo I rR 3100K Studio SMPTE Phosphors Gamma 0 44 0 46 0 45 i Dk Skin Ref Dk Skin Lt Skin iL x 33 2 39 2 kie Sky jur 20 7 31 8 Foliage ye 5 6 5 7 Bl Flower Bl Green C 21 5 32 3 Orange i lum dsi ig FTRT Blue Mod Red B DE 12 6 P aed PE RMS 19 2 Or Yellow i DH 2 3 plue l DH R
15. exit without changing anything by asking you to touch the No change amp Exit soft key again To return to the file you created touch the soft key on the display the file you created now appears there If you are making extensive changes to the file you can avoid losing all your changes by pressing the Update amp Exit soft key after each change and then re entering the file That way if you make a mistake and must exit the file your earlier work is retained while the most recent change or mistake is eliminated For more information about the other selections in the Video Source file refer to the VM 700T Option 01 NTSC amp Option 11 PAL User Manual Configuring Source Selection Video 1 8 The video limit files used by the VM 700T for video measurements are config ured in the Video Limit Files directory and specified in the Video Source Files directory Likewise the video source files are configured in the Video Source Files directory and specified in the Source Selection Video directory VM700T Option 21 Camera Measurements User Manual Configuring the Camera Option In the Source Selection Video file you can select a video source file if you intend to use a source file other than the system default for each of three sources Specifying a Video To specify a Video Source file use the following procedure Source File Touch the Source_Selection Video soft key 2 Rotate the front panel knob to highlight th
16. identifies unwanted signal non uniformities correlated to CCD cells CCD cameras only Frequency Response measures the degradation in waveform amplitude as the frequency of modulation increases CCD or tube cameras Measures aliasing components for CCD cameras Gamma measures the input to output light transfer characteristic of an imaging or display device CCD or tube cameras Geometry and Registration measures geometric distortions in camera imaging elements CCD or tube cameras Shading measures variation in camera output luminance levels when light input is constant CCD or tube cameras Vertical Smear measures the ability of the camera to handle excess light CCD cameras only For each measurement this section describes the purpose of the measurement the lighting and chart setup if any required for the measurement to produce accurate results the measurement display s and the meanings of data shown in the display and the measurement soft keys and their functions 1 Certain applications require the use of special charts if camera testing is to be successfully performed For information on procuring these charts refer to Procuring Test Charts on page 1 10 of this manual VM700T Option 21 Camera Measurements User Manual 2 1 Operating Basics Colorimetry Colorimetry measures the color fidelity of the output of a CCD or tube camera Measurement results include all the parameters defined in the CIELUV color spa
17. key 4 Touch the Weighting soft key to highlight it VM700T Option 21 Camera Measurements User Manual 2 15 Operating Basics Defects 2 16 Using a Custom Color Chart Defects Setup 5 Turn the knob until the desired weighting factor appears within the soft key 6 Touch the Save As Custom Ch soft key Once you have set up the Colorimetry measurement for a custom chart you can use it just like a Macbeth chart The colors listed on the right side of the Colorimetry display are shown as Color 1 Color 2 and so on The Defects measurement identifies defective cells in a CCD device Defective CCD cells can generate a high voltage output when the light input is low or a low voltage output when the light input is high They can also produce a varying output when the light input is held steady Under some conditions an aberration in luminance level of even a single pixel can be quite noticeable on a TV monitor Searching for CCD defects manually is a very time consuming task An operator must examine the output from the camera searching through every line for voltage deviations while the light input is held steady This must be done twice once with the camera capped once with the camera pointing at an evenly illuminated white chart The Defects measurement automates this tedious process looking over every line in the active video area and reporting the defects found In setting up to make a Defects measurement check
18. mV Acquire Acquire displays a submenu where you may specify acquisi tion locations 2 52 VM700T Option 21 Camera Measurements User Manual Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com Operating Basics Main Menu Set Rescale Threshold Ref White Acquire Camera ID Record f Stops HH HH Data 1to 100 1 to 100 Text entry Set f Stops Ref Iris Smr Iris keyboard Submenu EI L Undef Undef Acquire Submenu 1 4 to 64 1 4 to 64 Cannot exceed Ref Iris setting S pecial Block Block Position Mode Lines 2 to 32 Set Width Reference Aperature Exit Default Default Default Default Figure 2 25 The Vertical Smear menu tree Camera ID Record Data Camera ID displays an on screen keypad where you may enter an alphanumeric string to be used for camera identification This string appears on all displays produced by the measure ment as well as on measurement results files and screen captures It also carries over from one Camera application to another so you need not re enter this string with each measurement unless you change cameras Record Data stores current measurement results in a data file Each time you touch this soft key a new data file is created and stored in
19. number of frames appears then press the Average Frames soft key again Rescale Rescale restores the display to an optimum scale Reference Reference brings up a submenu to show store or use references Measure Measure displays a submenu with two soft keys where you may select between Depth of Modulation or Aliasing modes The currently selected mode is shown in the upper right corner of the display Acquire Acquire brings up a submenu where you may specify acquisition locations and blocks of lines on which to acquire and average data Camera ID Camera ID brings up an on screen keypad on which you can enter an alphanumeric string to be used for camera identifica tion This string appears on all displays produced by the measurement as well as on measurement results files and screen captures It also carries over from one Camera Testing application to another so you need not re enter this string with each measurement unless you change cameras Record Record Data stores current measurement results in a data file Data Each time you touch this soft key a new data file is created and stored in a file named Frequency Response N where N is one greater than the previously highest numbered Frequency Response file The file names start with Frequency Response 0 Reference Submenu Use 1 2 Use 1 2 Reference compares the current measurement Reference result with the selected reference 0dB Ref dB Ref Packet selects the packet to us
20. observed on the display Measurement results from this application can be passed to the Colorimetry application to measure color fidelity NOTE Gamma results passed to the Colorimetry application should be in the video format used by that application For example if you specify YPbPr input format for a Gamma measurement and pass the results to the Colorimetry application you should also measure colorimetry on a YPbPr input VM700T Option 21 Camera Measurements User Manual Operating Basics Gamma Display Figure 2 17 shows the Gamma main menu For the selected chart and light level the display graphs the superimposed input signal levels for each input channel versus time and shows the calculated gamma for each input channel Gamma NTSC Sync Ext Block Mode Start Fl L103 Step 108 End 211 Synchronous Camera Camera 1 NTSC Gamma A 0 44 Gamma B 0 44 Gamma C 0 45 mV Display A B C Wim Log Chart 5 10 15 20 25 30 35 40 45 50 55 60 Average Off Average Rescale Shading Display Acquire amp Camera ID Record Num 32 Comp Charts Data Figure 2 17 Gamma main menu and display VM700T Option 21 Camera Measurements User Manual 2 37 Operating Basics Gamma Menu Pressing the Menu button when the Gamma application is running displays the Gamma main menu The Gamma menu tree is shown in Figure 2 18
21. 0 cece eens 2 14 Using a Custom Color Chart 0 00 000 cece eee eee 2 16 Defects zeros asemena a DIS RU andes ON Bae ras Esta 2 16 Defects Setup redes eene aterert ue are e RR eS 2 16 Defects Display idee IRA Ree Ut o eed Na 2 17 Defects Menu eb Redde aed uere 2 18 Dil ts Res whats oe RN EBEN NU Dt 2 20 Detail Setup nee RR rete cod edge REA ER dS 2 20 Detail Display sisse ue BILE op ECOLE BOE GEI PERS 2 21 Detail Menu knee Rx ebur e EL 2 22 Fixed P ttern Nolte hast eee ea Same baa als v 2 23 Fixed Pattern Noise Setup 2 0 0 2 0 0 c eee eee eee eee 2 23 Fixed Pattern Noise Display 00 e cece eee eee eee 2 23 Fixed Pattern Noise Menu 0 ee eee eee ee eee eee 2 26 Frequency Responses ou elt wee be eb RS EAS Hp ER betes 2 28 Frequency Response Setup 0 0 cece cece eee eee nee ee 2 29 Frequency Response Display 2 0 cece eee eee eee eee 2 30 Frequency Response Menu 0 0 0 cee eee 2 32 Gamma s osepsCReesCeEkPPIIEN p ok Bare te RA a ORIS Ret eae ec age 2 35 Gamma Setup A gres eee ERR phd 2 36 Gamma Display ici tete RAS FEE Beet RES 2 37 Gamma Men esee EUER ex ee ex EU een 2 38 VM700T Option 21 Camera Measurements User Manual i Table of Contents Geometry and Registration 0 0 eee eee eh 2 41 Geometry and Registration Setup 0 0 0 0 eee eee eee ee 2 42 Geometry and Registration Display 0 000 000 ee eee 2 43 Geometry and R
22. 00T m For YPbPr output the Y output of the camera should be connected to channel A of the VM 700T the Pb output of the camera to channel B of the VM700T and the Pr output of the camera to channel C of the VM 700T m Forcomposite output the Y output of the camera should be connected to channel A of the VM 700T m The Camera Testing Option configuration file in directory nvramO Config Files must be set to the correct camera output format Choose the camera output format from the following choices m For NTSC Composite Composite with Setup GBR 700 GBR 700 Setup GBR 714 GBR 714 Setup YPbPr SMPTE EBU YPbPr 714 Betacam Setup YPbPr 714 Betacam YPbPr 700 MII Setup m For PAL Composite GBR YPbPr SMPTE EBU m Once the Camera Testing Option configuration file is set to the correct camera output format make sure that the current Video Source File points to the correct Camera Testing Option configuration file Then make sure that the Source Selection Video file points to the correct Video Source File Refer to Configuring the Camera Option beginning on page 1 1 for information about setting up these files Although the application accepts other formats the measurement should be made on GBR input GBR input lets you measure how well the three channels track Because of the algorithm selected to measure the gamma curve the measurement is always made on the increasing grayscale steps Both increasing and decreasing steps can be
23. 0T Option 21 Camera Measurements User Manual Operating Basics Shading nn Vert nn Vert Lines allows you to specify the number of vertical Lines lines in a custom chart The range is 12 to 40 vertical lines nn Horiz nn Horiz Lines allows you to specify the number of Lines horizontal lines in a custom chart The range is 9 to 40 horizontal lines Graticule Submenu Full Full Graticule shows the full chart overlaid with input from Graticule the camera Center Center Graticule displays only the chart center graticule Graticule Zones Zones displays zones to aid in characterizing deviations Zone shape may be either circular or octagonal and is specified at configuration Refer to Configuring the Camera Option beginning on page 1 1 for more information No No Graticule displays input from the camera without a Graticule superimposed graticule Shading is the variation in camera output luminance levels when light input is constant These peak to peak amplitude variations can be caused by the camera lens camera circuitry or by bias lighting in tube cameras The measurement is made for line and field rate horizontal and vertical shading respectively Shading is measured under two conditions m Camera lens capped black shading m Camera pointing at an evenly illuminated white field white shading Shading is usually measured by using a waveform monitor and noting the maximum and minimum video levels with either black or whi
24. 2 background FPN 2 23 Ball Chart 2 46 Bar Graph display 2 18 Block Average 2 34 Block Lines n 2 54 Block Lines nn 2 34 Block Mode 2 40 2 54 Block Step nnn 2 40 Box 2 40 C C 26 C F 2 20 camera connections Frequency response 2 29 Colorimetry 2 2 Gamma 2 36 Geometry and Registration 2 42 Camera ID 2 9 2 19 2 22 2 27 2 33 2 39 2 46 2 50 2 53 Camera Measurement Configuration file 2 28 Camera Output Standard 1 5 Camera Testing Configuration file creating 1 3 Camera Testing configuration file creating 1 3 deleting 1 6 editing 1 4 Camera Testing measurements 2 1 VM700T Option 21 Camera Measurements User Manual Camera Testing Option configuration file 2 2 2 29 2 36 2 42 Camera Testing file 1 1 CCD cells defective 2 16 Center 2 12 2 35 Center Cursor 2 46 Center Graticule 2 47 Change Acq Mode 2 12 Change Display 2 19 Charts 2 46 Chroma 2 6 Chroma Weighting 2 27 chromatic difference 2 6 CIE 1976 2 6 CIE Coordinates 1 5 CIELUV color space 2 2 color chart alignment 2 3 color check chart 1 10 Color difference 2 6 Color Packet 2 12 Colorimetry 2 2 2 16 average voltage level 2 3 custom chart 2 3 2 13 2 16 display 2 5 menus 2 8 setup 2 2 2 4 NTSC 2 2 PAL 2 2 Colorimetry display Color Measurement mode 2 5 Continuous Acquisition mode 2 7 Configuration Camera Testing configuration file 1 1 Source Selection Video file 1 8 Video Source file 1 6 1
25. 3 7 IRE 44 6 IRE 46 8 IRE Packet 1 dB 0 0 1 4 5 3 11 2 13 4 19 6 24 7 15 5 12 2 8 4 4 6 1 4 0 0 3 5 6 5 14 6 16 5 22 9 24 9 19 0 13 1 10 1 5 3 2 8 Average Off Figure 2 14 Frequency Response Measurement GBR output display 2 30 VM700T Option 21 Camera Measurements User Manual Operating Basics Frequency Response Sync Ext Depth of Modulation Field 2 Line 115 Synchronous Camera Studio NTSC Camera Amplitude 0 dB 45 5 IRE Packet 1 dB Y A 0 0 1 9 5 8 11 7 13 9 21 2 24 3 15 6 12 8 3 7 5 1 1 7 14 12 10 oN e Oo Q Average Off Figure 2 15 Frequency Response Measurement YPbPr output display VM700T Option 21 Camera Measurements User Manual 2 31 Operating Basics Frequency Response Pressing the Menu button when the Frequency Response measurement is running Menu brings up the Frequency Response main menu The Frequency Response menu tree is shown in Figure 2 16 Main Menu Average Rescale Reference Measure Acquire Camera ID Record Frames Data 2 to 32 Measure Text enti Submenu Y keyboard WM Alasing l Reference i Submenu Use 1 Use
26. 4 Figure 2 21 Geometry and Registration measurement menu tree 2 45 Figure 2 22 The Shading application display lees esses 2 48 Figure 2 23 The Shading menu tree 0 00 0 sees 2 49 Figure 2 24 The Vertical Smear main menu and display 2 52 Figure 2 25 The Vertical Smear menu tree esee esses 2 53 VM700T Option 21 Camera Measurements User Manual iii Table of Contents List of Tables Table 1 1 Editable Fields in the Camera Testing File 1 5 Table 2 1 White Chip Settings for Colorimetry Measurement Macbeth ColorChecker Chart Only 0 000 e ee eee ee eee 2 3 Table 3 1 Front Panel Button Names 0 00 00 e eee ee eee 3 3 Table 3 2 Exception Soft Key Names for Option 21 3 5 Table 3 3 NTSC Keywords for Get and Set Commands 3 7 Table 3 4 PAL Keywords for Get and Set Commands 3 7 iv VM700T Option 21 Camera Measurements User Manual Preface VM700T Option 21 Camera Measurements User Manual The following Camera Testing measurements are available with Option 21 of the VM700T Video Measurement Set m Colorimetry measures the color fidelity of a camera s output signal CCD or tube cameras m Defects identifies defective cells in CCD devices CCD cameras only m Detail measures the artificial sharpening transitions added to the video in both the horizontal and vertic
27. Choose the camera output format from the following choices m For NTSC standard Composite Composite with Setup GBR 700 GBR 700 with Setup GBR 714 GBR 714 with Setup YPbPr SMPTE EBU YPbPr 714 Betacam with Setup YPbPr 714 Betacam YPbPr 700 MII with Setup m For PAL standard Composite GBR YPbPr SMPTE EBU m Once the Camera Testing Option configuration file is set to the correct camera output format make sure the current Video Source File points to the correct Camera Testing Option configuration file Then make sure the Source Selection Video file points to the correct Video Source File Refer to Configuring the Option beginning on page 1 1 for information about setting up these files Freeze and Average functions are disabled 2 42 VM700T Option 21 Camera Measurements User Manual Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com Operating Basics Geometry and Figure 2 19 shows the main Geometry and Registration display and menus the Registration Display default registration chart is shown but others can be used as described earlier The display shows the type of chart selected and the operating mode Frame Chart at start up then the Geometry measurement followed by the Registration measurement Geometry Registration NTSC Sync Ext Frame Chart Ch A Camera Camera 1 ius rin Ball Registration TAZA TN NER RING NE BRA SESE DRT DA
28. Gamma Nominal Gamma SMPTE EBU 619 mV 662 mV GBR 700 MII GBR714 Betacam 631 mV 675 mV MII w setup 625 mV 665 mV GBR700 w setup Betacam w setup 637 mV 678 mV GBR714 w setupa a GBR signals coming directly from a camera normally do not have setup m If using a standard Macbeth color chart aim the camera so that the cross hairs in the camera viewfinder fall between the four center color chips on the chart These chips are moderate red purple red and yellow Set the camera s magnification so that the leftmost and rightmost edges of color chips on the chart lie within the viewing area Because of the differing aspect ratio between the Macbeth chart and the video camera leave approximately equal space above the top and below the bottom of the chart within the viewing area See Figure 2 1 m If using a custom color chart center the camera on the chart Set the camera magnification so that the leftmost and rightmost edges of color positions on the chart lie within the viewing area Leave approximately equal space above the top and below the bottom of the chart within the viewing area Be sure to tell the VM 700T the locations of the colors on the chart using the Acquire amp Charts Custom Charts Special Position soft key menu Refer to Using a Custom Chart on page 2 13 VM700T Option 21 Camera Measurements User Manual 2 3 Operating Basics Center the view finder crosshair at the center of the color chart and adjus
29. Histogram 2 27 Hue angle 2 6 Hue difference 2 6 Illum 2 10 Illum 31K 2 10 Illum 32K 2 10 Illum D65 2 10 Illum soft key 2 4 K keyboard Setl 1 3 Set2 1 3 L L 2 6 Last Step nn n USec 2 41 Lightness 2 6 Linear Chart 2 40 Linear Gamma 23 2 11 Log Chart 2 40 Low Pass 4 2 MHz 2 28 Low Pass 5 0 MHz 2 28 VM700T Option 21 Camera Measurements User Manual Index Macbeth Chart 2 12 Macbeth color chart 2 3 Manual Steps 2 41 Meas Conditions 2 9 Meas Parameter 2 19 Measure 2 33 2 45 Measure Cycles n 2 41 Measured Gamma 2 12 measured position color 2 7 Median Filter 2 49 N n Frames Averaged 2 20 nn Horiz Lines 2 47 nn Vert Lines 2 47 No Graticule 2 47 Noise FPN 2 27 Nominal CCIR 709 2 3 2 11 NTC 7 Weighting 2 27 O out of bandwidth packets 2 29 Overlay Channels 2 40 P Packet 2 35 Parade Channels 2 40 Pass to Clrimetry 2 40 Phosphors 2 10 Positioning the Camera 2 14 Previous Menu 2 11 2 12 2 34 R Record Data 2 9 2 19 2 22 2 27 2 33 2 39 2 46 2 50 2 53 Ref Iris f 2 54 Ref White nnn 3 2 52 Reference 2 9 2 33 Reference Default 2 54 reference position color 2 7 reference white 2 2 reference white defined Y value 1 5 Registra Ch B 2 46 Registra Ch C 2 46 Relative to Ref 2 9 2 10 VM700T Option 21 Camera Measurements User Manual Remote operation command format 3 2 commands 3 2 execu
30. MS 8 5 0 2 0 4 0 6 u Reference Meas Acquire amp Camera ID Record Condition Charts Data Figure 2 2 Colorimetry measurement display in Color measurement mode VM700T Option 21 Camera Measurements User Manual 2 5 Operating Basics Reference color data supplied with the VM 700T is furnished in terms of the CIE 1976 L u v CIELUV color model The following color parameters measured are shown for each color along with their reference values L AE AH 2 6 Lightness This is a measure of a color s lightness relative to reference white This is a chromatic parameter that describes the degree of redness u or greenness u found in a color It is also a function of Lightness Neutral gray colors have a u value of 0 0 This is a chromatic parameter that describes the degree of yellowness v or blueness v found in a color It is also a function of Lightness Neutral gray colors have a v value of 0 0 Chroma This parameter gives an indication of a color s vividness or saturation This is a function of both u and v Hue angle This is essentially an indicator of the color family in which a color falls This is most commonly associated with a color name such as red green purple etc Color difference This is a distance in CIELUV space that accounts for both luminance and chromatic variations between two colors This value is computed by means of the following formula AE
31. R RARI AN RING AC NAA M DENM ui 7 n RU A A DRE RU MU NN NN CE ENNEN E i p Ml s ix Continuous Acquisition Video Lvl Center 584 mv LILLILRLL 3 11181 711 KUN ANNAN DTI TA ONE IRE SOM IU RENE EA ESAS SUN NICE HEN IS A A ES Frame Rescale Graticule Charts Camera ID Record Chart to 100 Data Figure 2 19 Geometry and Registration display in Frame Chart mode The application starts in Frame Chart mode In this mode the input is not averaged Each field is acquired and displayed as quickly as possible to aid in framing the chart Since speed is important only the displayed area is acquired If the camera position relative to the chart is moving it is important to use the Frame Chart soft key so the VM700T can accurately measure the relative location of the chart By using the Expand function zoom you can accurately center and frame the camera relative to the chart The Geometry measurement can be made once the chart is framed This measurement must be completed before registration can be measured If the camera is moved relative to the chart the measurement process starting with chart framing must be repeated VM700T Option 21 Camera Measurements User Manual 2 43 Operating Basics The result is the monitor like display shown in Figure 2 20 The worst errors in each quadrant upper right and left lower right and left are reported The locations of these errors are indicated on the
32. RS 232C port requirements in detail and shows typical cable wiring configurations For information on using GPIB for remote operation see the VM 700T Option 48 GPIB Interface Programmer Manual Capabilities available while operating the VM 700T from a remote location include the following m making a specific manual measurement or Auto mode set of measurements W executing and interrupting a function Function Key m changing temporarily the configuration of a channel limit files selected measurement files and measurement location files printer type and port for each type of output Copy Report Log W specifying an End of File character for printer output The remote commands used to access the Camera measurement functions are the same as those used for other VM 700T functions The command arguments are listed and described below The information in this section assumes that you are familiar with manual operation of the VM 700T and understand the principles of remote VM 700T operation For information on working with VM 700T remote control commands see the VM 700T RS 232 Interface Programmer Manual NOTE Rather than being a complete discussion the following material is an abbreviated explanation of the remote commands It assumes that you under stand the principles of remote VM 700T operation and have access to the VM700T Option 01 amp 11 User Manual and the VM 700T RS 232 Interface Programmer Manual VM700T Option 21
33. Test Equipment Depot User Manual 1 800 517 8431 Tektronix Y VM700T Video Measurement Set Option 21 Camera Measurements 070 9653 00 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com SELLY SSeS SSS Table of Contents Preface i voc a CP Ceu Ne T Si hele v Configuring the Camera Option Creating new Camera Testing Files 0 0 0 cee cece eee eee Creating a Camera Testing Configuration File 1 3 Editing a Camera Testing Configuration Parameter 1 4 Deleting a Camera Testing Configuration File 0 0 00 0000 1 6 Configuring the Video Source Files 0 0 cece eee ee eee eee 1 6 Editing the Video Source File 2 2 0 0 00 eee eens 1 7 Changing Video Source File Parameters 0 000 e eee 1 7 Configuring Source Selection Video 0 0 eee c eee ene 1 8 Specifying a Video Source File ooooooooooooororornrr o 1 9 Procuring Test Charts llle 1 10 Operating Basics Col riietEy mac ear RARO es ed AUR e A ecu de Decet lotos 2 2 Colorimetry Setup vererven e E E E ee cette eens 2 2 Colorimetry Display serres mesaer n a ccc ccc e 2 5 Colorimetry Menu 0 e neces 2 8 Using a Custom Chart oo oooooooccororr eh 2 13 Positioning the Camera for a Custom Chart 0 0 0000 eee 2 14 Setting Up a Custom Chart 0 20 00
34. Use 3 Use 4 Use 5 Use 6 Default Reference Reference Reference Reference Reference Reference Reference Meas Conditions Submenu Illum Phosphors Gamma Illum Illum Illum Custom Previous D65 31K 32K Illum Menu EBU SMPTE Custom Previous Phosphor Phosphor Phosphor Menu Linear Nominal Measured Previous Gamma CCIR 709 Gamma Menu Acquire amp Charts Submenu Specia Macbeth Custom Change Position Chart Chart Colors Acq Mode 1 to 50 Width Color Center Weighting Acq Line Continual Save as Cycle Packet HHF pSec FH Fl L Acq Yes No CustomCh 1 to 32 1 to 24 13 5 to 56 5 0 00 to 1 00 1 to 263 Available only when Color Packet is selected Figure 2 4 Colorimetry menu tree 2 8 VM700T Option 21 Camera Measurements User Manual Operating Basics Main Menu Average Average Num specifies the weighting factor to be used for Num averaging The Average Num range is 1 to 256 The default value is 32 To change the Average Num value touch the Average Num soft key to highlight it rotate the knob until the desired weighting factor appears then press the Average Num soft key again Rescale Rescale restores the display to the optimum scale Reference Reference brings up a submenu that allows you to store examine or make use of reference data values Meas Meas Conditions brings up a submenu that lets you to Conditions inform the VM700T about the illumination camera phosphor and gamma correction being us
35. VM700T Option 21 Camera Measurements User Manual Operating Basics clip knee and detail circuits of the camera must be disabled before making the vertical smear measurement The following steps may be used as a procedure for measuring and computing smear 1 After deciding on the luminance levels for reference and smear threshold enter the values with the application soft keys 2 Adjust the camera lens iris to obtain the reference video level in the aperture area 3 Note the lens f stop with a soft key 4 Adjust the iris again to obtain the smear threshold in the black areas monitored 5 Now note the lens f stop again with the soft key The dB error result is derived from the f stop values you entered The followomg equation is used for the vertical smear computation Reference Level Reference Iris Vertical Smear dB 20 log cS eu 20 oe rere A Tris Vertical Smear Setup The Vertical Smear measurement accepts input in any video format Each channel is acquired and measured separately using the Source Selection hard keys Vertical Smear Display The Vertical Smear application display shown in Figure 2 24 is parade style allowing you to observe three different areas in the active video The video level at the aperture is used as the reference while the black areas above and below the aperture are monitored the boxed area in each display shows where measure ments are taken VM 700T Option 21 Camera Mea
36. a file named Vertical Smear N where N is one greater than the previously highest numbered Vertical Smear file The file names start with Vertical Smear 0 Acquire Submenu Special Position Special Position displays a submenu where you may specify acquisition parameters and defaults VM700T Option 21 Camera Measurements User Manual 2 53 Operating Basics Block Mode Block Lines n Block Mode activates block mode where you may specify a block of lines from which to acquire data When Block mode is active the line immediately under the camera identifier shows the block start and end lines Block Lines n allows you to size a block by specifying the number of lines it contains To specify the number of lines in a block press the soft key and turn the knob The range is 2 to 32 lines Special Position Submenu Set Set Default pressing this soft key sets the default measure Default ment window size If the Width Reference or Aperture soft key is selected pressing the Set Default soft key sets that selection to its system default Width Width Default sets the window width for the Vertical Smear Default measurement Reference Reference Default sets the black window position for the Default measurement Aperture Aperture Default sets the measurement window position Default Exit Exit returns to the main display with no soft keys shown f Stops Submenu Ref Iris Ref Iris f sets the reference iris f stop Range is
37. al directions as a percentage of transition amplitude CCD or tube cameras m Fixed Pattern Noise identifies unwanted signal nonuniformities correlated to CCD cells CCD cameras only m Frequency Response measures the degradation in waveform amplitude as the frequency of modulation increases CCD or tube cameras Measures aliasing components for CCD cameras m Gamma measures the input to output light transfer characteristic of an imaging or display device CCD or tube cameras m Geometry and Registration measures geometric distortions in camera imaging elements CCD or tube cameras m Shading measures variation in camera output luminance levels when light input is constant CCD or tube cameras W Vertical Smear measures the ability of the camera to handle excess light CCD cameras only Configuring the Camera Option tells you how to set up the VM 700T configura tion files to use the Camera Testing measurements Operating Basics explains the operation of each of the measurements listed above For each measurement this section describes the purpose of the measurement the lighting and chart setup required for the measurement to produce accurate results the measurement display s and the meanings of data shown in the display and the measurement soft keys and their functions Remote Commands and Keywords tells how to use Option 21 in remote mode This section explains the keywords application names and soft key names used wi
38. aliasing is not valid and the Aliasing measurement soft key menu choice in the Frequency Response measurement will not be displayed If Aliasing is the selected choice when the packets are redefined to an invalid choice the Frequency Response measurement defaults to Depth of Modulation VM700T Option 21 Camera Measurements User Manual Configuring the Camera Option NOTE If you change a parameter and then decide you do not want to keep the change press the No change 8 Exit soft key The VM 700T verifies that you want to exit without changing anything by asking you to touch the No change amp Exit soft key again To return to the file you created touch the soft key on the display the file you created now appears there If you are making extensive changes to the file you can avoid losing all your changes by pressing the Update amp Exit soft key after each change and then re entering the file That way if you make a mistake and must exit the file your earlier work is retained while the most recent change or mistake is eliminated Deleting a Camera Testing Configuration File You can delete a modified Camera_Testing file with this procedure 1 In the Camera_Testing files directory touch the Delete soft key The query line the top line of the display asks you to select a file to be deleted 2 Select the file to be deleted by touching its soft key The VM700T begins the deletion process NOTE You can halt f
39. and a Sine wave Multiburst chart for Frequency Response Vertical Smear requires a simple target chart described in the section on using Vertical Smear that you can make when it is needed The remaining camera testing applications don t require charts The Macbeth ColorChecker chart is supplied with the Camera Testing applica tion the remaining charts and replacement copies of the MacBeth ColorChecker chart can be procured from DSC Laboratories A division of D and S Corley Limited Ontario Canada L4V IRI DSC products recommended for use with Option 21 are TEK AS TEK AT and TEK CI Please contact DSC Laboratories for details and pricing of DSC products VM700T Option 21 Camera Measurements User Manual Aa AA Operating Basics Operating Basics Refer to the VM700T Option 01 NTSC and Option 11 PAL User Manual for operating information of the VM700T Video Measurement Set This section provides operating information for the Camera Testing measurements The following Camera Testing measurements are available with Option 21 of the VM700T Video Measurement Set Colorimetry measures the color fidelity of a camera s output CCD or tube cameras Defects identifies defective cells in CCD devices CCD cameras only Detail measures the artificial sharpening transitions added to the video in both the horizontal and vertical directions as a percentage of transition amplitude CCD or tube cameras Fixed Pattern Noise
40. ant 32k Illum 32K Store Ref Menu Store Reference Illuminants Temp_Custom_Chart Frequency Response Illum Temp Custom Ch DOM_Rescale Rescale 0dB_Ref OdB Ref Packet Packet_Width Width Packet Num Packet Packet Location Center This section documents the Camera measurement keywords used with the get and set commands see Table 3 3 and Table 3 4 For each get set keyword it gives the syntax of the set command and the get result a description of what the keyword does and the upper and lower limits of its range For information on working with VM 700T remote commands refer to the VM 700T RS 232 Interface Programmer Manual VM700T Option 21 Camera Measurements User Manual Remote Commands and Keywords Table 3 3 NTSC Keywords for Get and Set Commands Keyword Description Range XCOS Camera Output standard Composite Composite Setup GBR 700 system default GBR 700 Setup GBR 714 GBR 714 Setup YPbPrSMPTE EBU YPbPr 714 Betacam Setup YPbPr 714 Betacam YPbPr 700 MII Setup XSWP Frequency Response Packets 6 to 12 XB6F Packets beyond 6 MHz From 1 to 12 XB6T Packets beyond 6 MHz To 1 to 12 XSWL Frequency Response field and line Fields 1 or 2 Lines 1 to 262 XGDR Reference mV 0 to 999 9 mV XG01 to XG12 Y G Packet 1 dB to Y G 40 dB to 40 dB Packet 12 dB XBDR Reference mV 0 to 999 9 mV XB01 to XB12 B Packet 1 dB to B Pack
41. between the different formats The measurement should be made on GBR input because GBR input lets you measure how well the three channels track each other VM700T Option 21 Camera Measurements User Manual Operating Basics Detail Display Figure 2 8 shows the Detail display Two separate screen displays graph the horizontal and vertical waveforms line rate and field rate displays respectively This application measures vertical and horizontal detail and reports results as a percentage of transition amplitude mv 750 700 650 600 550 500 450 400 350 300 250 200 150 100 50 50 ee Num SEO QUOI OU eO o oe Detail NTSC Sync Ext Field 1 Line 138 Synchronous Camera Camera 1 NTSC Average Off Average Rescale 32 oo0o0o000000000000 gt o Line Rate Display mV Field Rate Display 750 r 700 650 600 550 500 450 400 350 Pia vite e Og 250 200 150 100 L75 L 209 F2 F2 Rise 0 6 Fall 0 4 Rise 0 4 Fall 1 55 V LinePos Camera ID Record 35 4uSec Data Figure 2 8 Detail measurement screen and waveform display NOTE Figure 2 8 shows the Detail display and menus The signal shown may not represent the type of signal normally used to perform this measurement VM700T Option 21 Camera Measurements User Manual 2 21 Operating Basics Detail Menu Pressing the Menu hard key when the Detail m
42. causes the application to assume that the chart used is logarithmic has a gamma of 2 2 rather than linear Block Mode lets you select a block of lines in the current field on which to observe increasing and decreasing luminance steps Block Step nnn lets you set the number of lines that are stepped in block mode when the application performs the measurement the range is 2 to the end of the field VM700T Option 21 Camera Measurements User Manual Operating Basics Special Position Submenu Manual Manual Steps sets the number of luminance steps in the Steps signal With the soft key selected rotate the knob to set the number of luminance steps 3 to 12 1st Step lst Step nn n pSec sets the position of the first luminance nn n Sec step edge of staircase With the soft key selected rotate the knob to set the position of the first luminance step edge of staircase 0 9 to 79 5 Last Step Last Step nn n uSec sets the position of the last luminance nn n pSec step edge of staircase With the soft key selected rotate the knob to set the position of the last luminance step edge of staircase 0 9 to 79 5 Measure Measure Cycles n sets the number of chrominance subcarrier Cycles n cycles measured in each step The width of the displayed box shows the measurement area determined by the selected number of cycles With the soft key selected turn the knob to change the number of cycles 1 to 20 Exit Exit leaves the Special Posit
43. ce as well as the additional color differences derived from the CIELUV color space A weighted RMS result provides a single parameter that indicates the color reproduction capabilities of the camera Colorimetry Setup In setting up to make a Colorimetry measurement check the following items m All three camera output channels should be connected to input channels on the VM 700T m For GBR output the G output of the camera should be connected to channel a of the VM 700T the B output of the camera to channel B of the VM 700T and the R output of the camera to channel C of VM 700T m For YPbPr output the Y output of the camera should be connected to channel A of the VM 700T the Pb output of the camera should be connected to channel B of the VM 700T and the Pr output of the camera should be connected to channel C of the VM 700T m For composite output the Y output of the camera should be connected to channel A of the VM 700T m The Camera Testing Option configuration file in directory nvramO Config Files must be set to the correct camera output format Choose the camera output format from the following list m For NTSC Composite Composite with Setup GBR 700 GBR 700 Setup GBR 714 GBR 714 Setup YPbPr SMPTE EBU YPbPr 714 Betacam Setup YPbPr 714 Betacam YPbPr 700 MII Setup m For PAL Composite GBR YPbPr SMPTE EBU m Once the Camera Testing Option configuration file is set to the correct camera output format mak
44. channel letter The keywords available are listed in the following section The channel letters available are A B or C VM700T Option 21 Camera Measurements User Manual Remote Commands and Keywords Example VM700T gt get YCOS A The above example returns the PAL Camera Standard for channel A getresults The getresults command stores Measure or Auto mode measurement results in default files in the Measurement Results directory In Measure mode entering getresults with no argument s stores the measurement results for the current measurement If no measurement is currently being executed the message Request not supported is returned If a measurement is being executed the message Results in file filename is returned After the file name has been returned use the show filename command to view the results Example VM700T gt getresults Results in file Colorimetry hardkey button_name The hardkey command indicates the press and release of the specified front panel button button_name Using hardkey is equivalent to entering hardpress and hardrelease however in general hardkey should be used instead of these commands Example VM700T gt hardkey Menu Front panel button names are listed in Table 3 1 Table 3 1 Front Panel Button Names A Display Picture Auto Fez Selectiine Average Graticule Vector B Help Waveform C Menu XY Arrow selector Copy MoveExpand
45. cket number select the soft key and turn the knob Center nn usec defines the center of the measurement area To change the location select the soft key and turn the knob Available only when Color Packet is selected Weighting assigns a weighting factor ranging from 0 0 to 1 0 to the color packet To change the weighting factor select the soft key and turn the knob Available only when Color Packet is selected Acq Line sets the color packet to start acquisition on the current line Available only when Color Packet is selected Continual Acq selects continuous acquisition of an individual color Available only when Color Packet is selected VM700T Option 21 Camera Measurements User Manual Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com Operating Basics Save As Save As Custom Ch saves the current parameters as the Custom Ch custom chart Field Field Toggle is displayed when the Select Line hard key is Toggle pressed This soft key toggles the display between field 1 and field 2 Default Default Line is displayed when the Select Line hard key is Line pressed Selects the line specified as the default at configura tion NOTE You may exit and re enter the application while defining or changing a custom chart without losing entered information However special positions entered via the Acquire amp Charts Submenu are not saved for function
46. cy Response measurement defaults to Depth of Modulation Acquire Submenu Special Special Position brings up a submenu to define the Position acquisition locations Block Block Average causes results from successive video lines on Average successive frames to be averaged The number of lines averaged is specified with the Block Lines soft key Block Block Lines nn specifies the number of times successive Lines nn frames are accessed to acquire one line of measurement data for the block averaging function the range is 2 to 32 lines which means that the application acquires one line from each of 2 to 32 successive frames then returns to the first frame and performs the average function VM700T Option 21 Camera Measurements User Manual Operating Basics Gamma Special Position Submenu Set Set Default resets the acquisition position to its default Default location for the selected packet If no packets are selected all packets are reset to their default acquisition locations Width Width sets the width of the measurement area To change the Default width select the soft key and turn the knob Packet Packet selects the packet to redefine To change the packet number select the soft key and turn the knob Center Center Default defines the center of the measurement area Default To change the location of the center select the soft key and turn the knob Exit Exit returns to the Frequency Response or the Aliasing d
47. d Pattern Noise Menu Pressing the Menu button when the Fixed Pattern Noise measurement is running brings up the Fixed Pattern Noise main menu The Fixed Pattern Noise menu tree is shown in Figure 2 13 Main Menu Noise FPN Remove Rescale Filters Camera ID Expanded Spectrum Histogram Record Shading Selection Picture Data Filters Selection Submenu Fsc Trap High Pass NTC 7 Chroma Low Pass Unified Low Pass Filter 100 kHz Weighting Weight 4 2 MHz Weighting 5 0 MHz Figure 2 13 Fixed Pattern Noise menu tree 2 26 VM700T Option 21 Camera Measurements User Manual Operating Basics Main Menu Noise FPN Remove Shading Rescale Filters Selection Camera ID Expanded Picture Spectrum Histogram Record Data Noise FPN acquires one more frame of data computes total noise and subtracts Fixed Pattern Noise previously calculated to derive the random noise in the input video This noise is displayed in the upper left rectangle on the screen Remove Shading removes horizontal shading when high lighted Rescale restores the display to its default scale Filters Selection brings up a submenu to select one or more noise filters Camera ID brings up an on screen keypad on which you can enter an alphanumeric string to be used for camera identifica tion This strin
48. e Camera Output Standard NTSC Choices PAL Choices Composite Composite with Setup GBR 700 system default GBR 700 Setup GBR 714 GBR 714 Setup YPbPrSMPTE EBU YPbPr 714 Betacam Setup YPbPr 714 Betacam YPbPr 700 MII Setup Composite GBR YPbPr SMPTE EBU Frequency response results dB or percent Zone selection Circular or octagonal Frequency Response Packets Packets X to X beyond 6 MHz 6 to 12 Choice for both X s is 1 to 12 Location Field and Line Frequency Response or Locations Frequency Response Line NTSC Choices Field 1or2 Line 1 to 262 PAL Choices 1 to 625 Limits Upper and Lower Custom illuminant light source Custom phosphor CIE Coordinates Limits for the frequency response reference and all the packets can be set The Reference voltage limit is 0 to 999 9 mV lower to upper The packet limits are 40 to 40 dB Any limit can be set to undefined Color temperature K x y z coordinates Color phosphor Green Blue and Red x y z values Y u v values for 50 colors Note reference white is defined by the VM 700T to have a Y value of 100 00 a Ifyou use a frequency response chart that has no frequency packets outside the 6 MHz BW of the VM700T aliasing is not required You can eliminate the Aliasing measurement by defining invalid packets for example 9 to 8 in the wrong order for the packets beyond the 6 MHz BW of the VM700T In this case
49. e as the 0 dB reference Packet 1 To change the packet number select the soft key and turn the knob Store Store Reference displays a submenu where you may store or Reference show the current measurement result VM700T Option 21 Camera Measurements User Manual 2 33 Operating Basics 2 34 Store Show Reference Submenu Store 1 2 Store 1 2 Reference stores the current measurement Reference result as a reference Show 1 2 Show 1 2 Reference displays the stored reference Reference Previous Previous Menu returns to the previously selected menu Menu Measure Submenu Depth of Depth of Modulation DOM measures the waveform Modulation amplitude degradation as the modulation frequency increases Aliasing Aliasing measures the packets that are outside the 6 MHz bandwidth of the VM 700T The aliased components are measured and their frequencies and amplitudes are reported NOTE If you use a frequency response chart that has no frequency packets outside the 6 MHz BW of the VM 700T aliasing does not occur You may eliminate the Aliasing measurement by defining out of bandwidth packets in the reverse order for example 9 to 8 for the packets beyond the 6 MHz BW of the VM 700T In this case Aliasing becomes invalid and that soft key choice in the Frequency Response measurement menu will not be displayed If Aliasing is the selected choice when the packets are redefined to eliminate the Aliasing measurement the Frequen
50. e source for which you are specifying a video source file source A B or C 3 Touch the highlighted source file to select it 4 Rotate the front panel knob to change the Video Source file selection 5 When you have selected a Video Source file touch the Accept Input soft key 6 If the change is correct touch the Update amp Exit soft key If the change is not correct touch the No change amp Exit soft key and redo the change NOTE If you change the video source file and then decide to exit the directory and cancel the change you must press the Accept Input soft key followed by the No change 8 Exit soft key The VM 700T verifies that you want to exit the Source Selection Video directory and cancel any changes by asking you to touch the No change 8 Exit soft key again Camera Testing measurements that need all three input channels use the Channel A configuration Camera Testing measurements that need only one input channel use the configuration for the channel indicated by the lighted VM700T front panel button VM700T Option 21 Camera Measurements User Manual 1 9 Configuring the Camera Option Procuring Test Charts 1 10 Some applications discussed in this manual require that the camera under test be pointed at a test chart Types of charts required for this option include the a color check chart for Colorimetry the RETMA registration chart for Geometry and Registration a gray scale chart for Gamma and Detail
51. e sure that the current Video Source file points to the correct Camera Testing Option configuration file Then make sure that the Source Selection Video file points to the correct Video Source File See Configuring the Camera Option beginning on page 1 1 for information about setting up these files m After white balancing the camera use the VM 700T Waveform application to set the average voltage level of the white chip on the color chart as shown in Table 2 1 This table shows the recommended voltage levels for reference white on a color check chart as a function of output format and gamma correction applied by the camera Colour Science in Television and Display Systems W N Sproson 1983 2 2 VM700T Option 21 Camera Measurements User Manual Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com Operating Basics Linear gamma means the camera applies no gamma correction Nominal CCIR 709 means the camera applies a gamma correction factor of 0 45 When setting the average voltage level of the white chip with GBR camera output Tektronix recommends that you use the green input channel on the VM700T channel A When setting the average voltage level of the white chip with YPbPr camera output you must use the Y input channel on the VM700T channel A Table 2 1 White Chip Settings for Colorimetry Measurement Macbeth ColorChecker Chart Only Format Linear
52. easurement is running displays the Detail main menu Figure 2 9 shows the Detail menu tree Average Num 44 Rescale V LinePos Camera ID Record HEH uSec Data 1 to 256 10 3 to 61 4 USec NTSC 10 6 to 61 7 Sec PAL Text entry keyboard Figure 2 9 Detail menu tree Detail Menu Average Num nn Rescale V LinePos nn n psec Camera ID Record Data Average Num nn specifies the weighting factor to be used for averaging The Average Num range is 1 to 256 The default value is 32 To change the Average Num value touch the Average Num soft key to highlight it rotate the knob until the desired weighting factor appears then press the Average Num soft key again Rescale restores the display to its default scale V LinePos nn n mSec places the horizontal detail measure ment position at the center of the bar at the location of the white chip in the line rate display Camera ID brings up an on screen keypad on which you can enter an alphanumeric string to be used for camera identifica tion This string appears on all displays produced by the measurement as well as on measurement results files and screen captures It also carries over from one Camera Testing application to another so you need not re enter this string with each measurement unless you change cameras Record Data stores current measurement results in a data file Each time you touch this soft
53. easurements can be made using a VM700T and a chart that contains black vertical and horizontal lines on a white background To make these measurements the detail circuit of the camera must be disabled the luminance level must be at least 100 0 mV referenced to back porch and the lens should be focused on the test chart being used The VM700T must be set for the chart used for the measurement so it can generate the proper grid on the display The selected chart must be properly framed for this measurement to be valid The chart is set up by superimposing the camera input over the generated grid much as was done with the ball chart and grid generator While monitoring the VM700T display the camera is tilted panned or zoomed to correctly frame the chart Default charts available include a registration chart and the EBU chart You may also define a custom chart but if you do so the lines on the chart must be evenly spaced Geometry and The Geometry and Registration application accepts only GBR input Configura Registration Setup tion information is always read from channel A The source selection hard keys do not change the acquisition source In setting up to make a Geometry and Registration measurement check the following items m Connect green to channel A blue to channel B and red to channel C m The Camera Testing Option configuration file in directory nvramO Config Files must be set to the correct camera output format
54. ed and their frequencies and amplitudes are reported The aliased component amplitude is referenced to the user selected reference packet Frequency In setting up to make a Frequency Response measurement check the following Response Setu P P For GBR output all three camera output channels should be connected to input channels on the VM700T The G output of the camera should be connected to channel a of the VM 700T the B of the camera output to channel B of the VM 700T and the R output of the camera to channel C of VM700T W For YPbPr output the Y output of the camera should be connected to channel A of the VM700T the Pb output of the camera should be connected to channel B of the VM700T and the Pr output of the camera should be connected to channel C of the VM 700T m For composite output the Y output of the camera should be connected to channel A m The Camera Testing Option configuration file in directory nvramO Config Files must be set to the correct camera output format Choose the camera output format from the following lists m For NTSC Composite Composite with Setup GBR 700 GBR 700 Setup GBR 714 GBR 714 Setup YPbPr SMPTE EBU YPbPr 714 Betacam Setup YPbPr 714 Betacam YPbPr 700 MII Setup m For PAL Composite GBR YPbPr SMPTE EBU m Once the Camera Testing Option configuration file is set to the correct camera output format make sure that the current Video Source File points to the correct Camera Testing
55. ed for the measurement Acquire amp Acquire amp Charts brings up a submenu that lets you specify Charts acquisition locations and provides other acquisition control Camera ID Camera ID brings up an on screen keypad on which you can enter an alphanumeric string to be used for camera identifica tion This string appears on all displays produced by the measurement as well as on measurement results files and screen captures It also carries over from one Camera Testing application to another so you need not re enter this string with each measurement unless you change cameras Record Record Data stores current measurement results in a data file Data Each time you touch this soft key a new data file is created and stored in a file named Colorimetry N where N is one greater than the previously highest numbered Colorimetry file The file names start with Colorimetry 0 Reference Submenu Store Store Reference brings up a submenu that allows you to save Reference current data values as a reference Relative Relative to Ref brings up a submenu to make measurements to Ref relative to a selected reference VM700T Option 21 Camera Measurements User Manual 2 9 Operating Basics Store Reference Submenu Store N Reference Relative to Ref Store N Reference stores the current measurement result as reference N Relative to Ref brings up a submenu to make measurements relative to a selected reference Use Reference Subme
56. egistration Menus 0 0 2 ce eee eee ee 2 45 Shading ci ee ab RES CHE Ae SAR ews RR as TS 2 47 shading Setup ii wise wea el RP atta ge nae et 2 48 Shading Display 2 ok Rec p EN SESE Re dE ER Re 2 48 Shading Men 5o Ev Sie gating o phe eas 2 49 Vertical Smear 3 52 Soke hese bias HESS eB RENE DERE e eret 2 50 Vertical Smear Setup is bata bath Seb a e ERE IS 2 51 Vertical Smear Display ci sscetereeisseetiioniidrol piret eee 2 51 Vertical Smear Menus 0 2 0 0 ec ee eee 2 52 Remote Commands and Keywords Camera Measurement Remote Commands 00 00 0000 e 3 2 execute application cesses 3 2 get keyword channel letter cene 3 2 getresults aria dea A Tet ees 3 3 hardkey button name ooooooccccc e mee 3 3 set keyword channel letter valuel value2 lees 3 4 show filename s sch RU ERRORES CEPR URN CER IRA HE aS 3 4 softkey sofikey name 0 cece eh 3 4 get and set keywords ios ee gd gps ddp ege teg ee 3 6 Index ii VM700T Option 21 Camera Measurements User Manual Table of Contents List of Figures Figure 1 1 The Configure menu 0 0 0 0 oo 1 2 Figure 1 2 Camera Testing measurement limit menu choices 1 2 Figure 1 3 File naming keyboard 0 0 0 eese 1 4 Figure 1 4 Selecting a file to use as a template ooo oooooooooo ooo 1 8 Figure 2 1 A MacBeth ColorChecker chart camera setup for colorimetry meas
57. et 40 dB to 440 dB 12 dB XRDR Reference mV 0 to 999 9 mV XRO1 to XR12 R Packet 1 dB to R Packet 40 dB to 40 dB 12 dB Table 3 4 PAL Keywords for Get and Set Commands Keyword YCOS YSWP YB6F YB6T YSWL YGDR YGO1 to YG12 Description Camera Output standard Frequency Response Packets Packets beyond 6 MHz From Packets beyond 6 MHz To Frequency Response line Reference mV Y G Packet 1 dB to Y G Packet 12 dB Range Composite GBR YPbPrSMPTE EBU 6 to 12 1 to 12 1 to 12 Lines 1 to 625 0 to 999 9 mV 40 dB to 40 dB VM700T Option 21 Camera Measurements User Manual 3 7 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com Remote Commands and Keywords Table 3 4 PAL Keywords for Get and Set Commands Cont Keyword YBO1 to YB12 YRO1 to YR12 Description Reference mV B Packet 1 dB to B Packet Reference mV R Packet 1 dB to R Packet Range 0 to 999 9 mV 40 dB to 40 dB 0 to 999 9 mV 40 dB to 40 dB 3 8 VM700T Option 21 Camera Measurements User Manual Index Index Numbers Ist Step nn n uSec 2 41 A Acq Line 2 12 Acquire 2 33 2 49 2 52 Acquire amp Charts 2 9 2 39 Aliasing 2 34 Aliasing measurement 2 28 Aperture Default 2 54 Average nn Frames 2 33 2 49 Average Num 2 9 2 38 Average Num nn 2 2
58. f bandwidth packets in the reverse order for example 9 to 8 for the packets beyond the 6 MHz BW of the VM 700T In this case Aliasing becomes invalid and that soft key choice in the Frequency Response measurement menu will not be displayed If Aliasing is the selected choice when the packets are redefined to eliminate the Aliasing measurement the Frequency Response measurement defaults to Depth of Modulation The following circuits must be disabled while making this measurement gamma knee black compression and expansion stretch and detail The light level should be set to allow optimum performance from the camera This means that the iris setting focus and focal length for zoom lenses must be set near the center of their adjustment ranges VM700T Option 21 Camera Measurements User Manual Operating Basics The framing of the chart is important for the measurement since multiburst packets are designed to be at specific frequencies or lines per picture height when the chart is appropriately framed For the DOM measurement the amplitude of each multiburst packet is measured relative to a user selected reference packet Measurement results are presented in either dB or percent selected at configuration The results for the packets that are out of the VM700T bandwidth are displayed on the dimmer bit plane The packets that are out of the VM700T bandwidth are used for the Aliasing measurement The aliased components are measur
59. fault Source C NTSC System Default System Default Timed Events System Default The softkey command soft key used as one word indicates the press and release of a specified soft key such as Cursors Using softkey is equivalent to entering softpress and softrelease however in general softkey should be used instead of these commands Example VM700T gt softkey Change Display However with certain soft keys the press must be held to make a control change VM700T Option 21 Camera Measurements User Manual Remote Commands and Keywords Example VM700T gt softpress Set_Temperature VM700T knob 400 VM700T gt softrelease Set Temperature NOTE The knob command rotates the control knob a certain number of clicks from its present setting For setting the temperature number a number of 40 produces a 1 C change 400 produces a 10 C change and 8 produces a 0 1 C change Use a minus sign to move the setting down With some exceptions the general rule for forming a softkey name is to take the spelling and capitalization from the soft key name on the display omit the variable part and join the words with _ underscore For example the soft key name for the H Density 700 pixels soft key is H_Density The exceptions for the Camera Testing option are given in Table 3 2 For soft keys that perform toggle operations such as on off the soft key name is followed by a colon The soft key displays the current sta
60. g appears on all displays produced by the measurement as well as on measurement results files and screen captures It also carries over from one Camera Testing application to another so you need not re enter this string with each measurement unless you change cameras Expanded Picture selects the Expanded Picture display Spectrum selects the Spectrum display of the selected line Histogram selects the histogram noise distribution display Record Data stores current measurement results in a data file Each time you touch this soft key a new data file is created and stored in a file named Fixed_Pattern Noise N where N is one greater than the previously highest numbered Fixed_Pattern Noise file The file names start with Fixed_Pattern Noise 0 Filters Selection Submenu Fsc Trap Filter High Pass 100 kHz NTC 7 Weighting Chroma Weight Fsc Trap Filter selects the frequency at subcarrier trap filter High Pass 100 kHz selects the 100 kHz high pass filter NTC 7 Weighting NTSC standard only selects the standard NTC 7 weighting filter Chroma Weighting PAL standard only filters the signal to display approximately 3 MHz to 6 MHz VM700T Option 21 Camera Measurements User Manual 2 27 Operating Basics Frequency Response 2 28 Low Pass Low Pass 4 2 MHz selects the 4 2 MHz low pass filter 4 2 MHz Unified Unified Weighting selects the standard CCIR unified Weighting weighting filter Low Pass Low Pas
61. graph and listed in the associated text readout Errors are expressed relative to center as percent of screen height Pressing the Cursor soft key activates a cursor that may be moved over the active video area Text on the display shows the error at the cursor location The various zones are also graphed on the display The zone type circular or octagonal can be specified in the Camera_Testing file at configuration Geometry Registration NTSC Sync Ext Geometry Ch A Camera Camera 1 NTSC Averaged 8 gt 8 Frames Measurement Completed HAHH AA H V Zone UL 0 36 0 90 3 UR 0 73 0 19 2 LL 0 568 0 92 3 LR 0 78 0 17 2 Cursor 0 10 0 15 1 Geometry Registra Registra Center Ch A Ch B Ch c Cursor Figure 2 20 Geometry and Registration display in Geometry measurement mode 2 44 VM700T Option 21 Camera Measurements User Manual Operating Basics Geometry and Figure 2 21 shows the Geometry and Registration menu hierarchy Registration Menus Main Menu Frame Rescale Measure Graticule Charts Camera ID Record Chart to HH Data Measure Submenu Geometry Registra Registra Center Cursor ChA ChB ChC Cursor Only after Geometry measurement completes Graticule Submenu Full Cen
62. hading stores the current shading result as a reference Store 2 Shading stores the current shading result as a reference Remove 1 Shading removes the shading provided by the prestored data Remove 2 Shading removes the shading provided by the prestored data VM700T Option 21 Camera Measurements User Manual 2 39 Operating Basics Pass to Pass to Clrimetry stores the measured results in a data file Clrimetry that can be accessed and used by the Colorimetry application Shading Shading Fit displays the fitting curve for shading references Fit Display Submenu Waveform Waveform displays the acquired waveform Box Box displays measured amplitude positions as boxes Fit Fit displays the fitting curve with the measured gamma Graticule Graticule Ref nn n displays the reference curve for the Ref nn n specified gamma number Source Source displays a submenu that allows you to select the input signal source channel A B or C Parade Parade Channels displays input signals side by side for signal Channels comparison Overlay Overlay Channels superimposes input channel signals the Channels default Acquire amp Charts Submenu Special Position Linear Chart Log Chart Block Mode Block Step nnn 2 40 Special Position displays a submenu where you may define acquisition locations Linear Chart causes the application to assume that the chart used is linear rather than logarithmic Log Chart
63. hange the average number turn the knob while touching the soft key Remove Shading removes horizontal shading when high lighted Touch the soft key to toggle the state of the shading filter Correct Threshold applies a correction factor to the threshold value entered by the user This correction factor compensates for the amplitude degradation due to the bandwidth rolloff of the VM 700T Touch the soft key to toggle the correction factor on and off C F informs the VM700T of the ambient temperature when the Defects measurement is being made To change the indicated temperature turn the knob while touching the soft key Temperature information is stored with measurement results in a results file for future reference NOTE Ambient temperature is entered by the user not measured by the VM 700T Detail is the artificial sharpening transitions added to the video in horizontal and vertical directions The detail added is measured as a percentage of transition amplitude The measurement uses any chart that contains a white patch such as a window or a grayscale chart with a white chip The white clip circuit of the camera should be disabled while performing this measurement In setting up to make a Detail measurement check the following item m The source selection hard keys are used to select and measure each channel separately The application accepts GBR color difference YPbPr composite video but does not distinguish
64. he upper left corner of the display Below that is a plot of the noise detected in the active video area This plot is created using a simple pixel on off selection scheme Pixels whose noise value is higher than a specified threshold appear white pixels whose noise value is lower than the threshold appear dark The threshold value is controlled by the histogram display Fixed Pattern Noise Syne Ext Noise Level 54 2 dB RMS Camera Tektronix Bldg 58 Studio NTSC Camera 100kHz 4 2MHz i Noise Distribution 4H 092 PE 262 Pixels Noise FPN Expanded Picture ciii teta feat o Remove Spectrum L 188 Shading Filters Selection 30 0 40 0 50 0 usec Rescale Camera ID Record Data Figure 2 10 Fixed Pattern Noise measurement histogram display 168 5 mv Beneath the noise plot of the entire active video area is the wave form plot for the selected line This plot appears in the lower left portion of the screen on all displays The selected line is shown as a solid line in the plot of the active video area To change the selected line press Select Line and turn the knob The histogram display shows the distribution of noise in the active video area This display controls the noise threshold value for the plot that appears to its left To change the threshold value touch the histogram and turn the knob Pixels whose measured noise value is greater than the new threshold value will be highlighted in the displa
65. hen set the acquisition line for the lowest numbered color packet first that needs resetting then for the next lowest and so on To change the location of measurement within a line for a color packet on a custom chart 1 Touch the Special Position soft key 2 Touch the Color Packet key to highlight it 3 Turn the knob until the number of the color packet whose acquisition line you wish to change appears in the soft key 4 Touch the Center soft key to highlight it 5 Turn the knob until the desired location appears in the soft key 6 Touch the Save As Custom Ch soft key To change the measurement width in cycles for all color packets on a custom chart 1 Touch the Special Position soft key 2 Touch the Width key to highlight it 3 Turn the knob until the desired width in cycles appears within the soft key 4 Touch the Save As Custom Ch soft key In the Colorimetry measurement each color packet has a weighting factor which is used in computing the overall color difference You can give each color on your custom chart a weighting factor from 1 full weighting to 0 no weighting the packet is not included in the color difference computation To change the weighting factor for a color packet on a custom chart 1 Touch the Special Position soft key 2 Touch the Color Packet key to highlight it 3 Turn the knob until the number of the color packet whose acquisition line you wish to change appears in the soft
66. ile deletion by pressing the Cancel soft key in the same position as the Delete soft key before the deletion process started You can also halt file deletion by touching the screen image of the file Nothing happens to a file whose deletion process is halted Configuring the Video Source Files 16 Touch the Video Source Files soft key to enter the Video Source Files directory The screen displays the video source files One file is always the System Default file see Figure 1 4 You can select and press a soft key to display the parameters in a System Default file but the parameters in this file cannot be modified To modify file parame ters you must do the following tasks W create a file using an existing file as a template usually the System Default file VM700T Option 21 Camera Measurements User Manual Configuring the Camera Option m name the file you created m edit the information in the new file as necessary W accept the edits If the system default video source file is acceptable the VM 700T uses it if it is selected as it performs video measurements If you must modify the video source file do the following steps as needed Editing the Video To modify the Video Source file follow this procedure Source File Touch the Create File soft key The query line the top line of the display asks you to select the file to be used as a template for your new file 2 Touch the appropriate soft key for the file you
67. ion display and returns to the main measurement display Field Field Toggle is displayed when the Select Line hard key is Toggle pressed This soft key toggles the display between field 1 and field 2 Default Default Line is displayed when the Select Line hard key is Line pressed Selects the line specified as the default at configura tion Geometry and Registration Geometry uses the green channel to measure geometric distortion of a camera s imaging elements In tube cameras geometric errors often appear as a pincushion effect caused by the deflection circuits In CCD cameras geometric errors are caused by lens distortion Registration measures how well the blue and red channels track the green channel This measurement is made with a registration chart consisting of black vertical and horizontal lines on a white background For CCD cameras geometry and registration do not change over the life of the CCD device since CCD chips are permanently bonded to prisms Tube cameras however must routinely have geometry and registration checked and adjusted The geometry measurement is typically made with a ball chart and a grid pattern generator and the error result is read from a TV monitor VM700T Option 21 Camera Measurements User Manual 2 41 Operating Basics The advantage to using the VM 700T for this measurement is it eliminates the need for the ball chart and grid pattern generator Instead both geometry and registration m
68. isplay with no soft keys displayed Gamma is the input to output light transfer characteristic of an imaging or display device CCD cameras are inherently linear but the gamma adjustment is still necessary when considering the whole system including the TV set The measurement requires a commonly available grayscale step chart with linear or logarithmic steps This chart contains two rows of grayscale steps one in increasing and the other in decreasing luminance levels The Gamma application characterizes the nonlinear transfer function with the camera s gamma using the following equation Video Level K L 4K1 4 K2 where K K1 and K2 are constants and L is the light source The application measures luminance at specific points fits a curve through the points and defines gamma according to the equation The measurement result is the gamma exponent measured on the camera s output NOTE The camera s detail circuit should be disabled for this measurement VM700T Option 21 Camera Measurements User Manual 2 35 Operating Basics 2 36 Gamma Setup In setting up to make a Gamma measurement check the following m For GBR color difference output all three camera output channels should be connected to input channels on the VM 700T The G output of the camera should be connected to channel A of the VM 700T the B output of the camera to channel B of the VM 700T and the R camera output to channel C of the VM 7
69. key a new data file is created and stored in a file named Detail N where N is one greater than the previously highest numbered Detail file The file names start with Detail 0 Pressing the Line Select hard key places the vertical detail measurement position at the center of the bar at the location of the white chip in the field rate display 2 22 VM700T Option 21 Camera Measurements User Manual Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com Operating Basics Fixed Pattern Noise The Fixed Pattern Noise measurement identifies signal nonuniformities that can be correlated to the CCD cell array Fixed pattern noise FPN can create observable patterns such as the vertical blinds effect FPN can also create effects that appear to be random like snow but that do not change from one frame to the next There are two types of FPN foreground FPN and background FPN Foreground FPN is measured with the camera pointed at an evenly illuminated white field The primary sources of foreground FPN are variations in aperture among individual photo sensors and structural defects within CCD devices Background FPN is measured at very low luminance or with the camera capped The black clip circuit should be turned off or set so that it does not interfere with video output The primary sources of background FPN are variations in dark current within individual pixels
70. ment location within a line of a color packet 1 Start the Colorimetry measurement 2 Press the Menu button 3 Touch the Acquire amp charts soft key 4 Touch the Custom Chart soft key Then follow one of the procedures listed below To specify the number of colors on a custom chart 1 Touch the Colors soft key to highlight it 2 Turn the knob to set the number in the soft key to the number of colors on your chart To change the acquisition line for a color packet on a custom chart 1 Touch the Special Position soft key 2 Touch the Color Packet key to highlight it 3 Turn the knob until the number of the color packet whose acquisition line you wish to change appears in the soft key 4 Press the Acq Line button 5 Turn the knob until the desired line appears on the soft key and in the upper left of the display 6 Touch the Save As Custom Ch soft key 2 14 VM700T Option 21 Camera Measurements User Manual Operating Basics NOTE Setting the acquisition line for a color packet resets the acquisition line for all higher numbered color packets that were not previously set For example if you were using a custom chart with 25 colors on it and reset the acquisition line for color packet 22 then the acquisition lines for color packets 23 24 and 25 would also be reset to that line UNLESS YOU HAD SPECIFICALLY SET THEM FIRST The suggested method of operating is to specify the number of colors in the chart t
71. move the high frequency component of the video input This removes the effect that CCD defects might have on measurement results Show Max Lines produces a multiple line display that lets you easily observe any horizontal shading trend in the field rate on the graph Touch the soft key and rotate the knob to change the number of lines displayed Acquire lets you select where the signal for the field rate display is acquired Acquire Special Position lets you define where acquisitions are actually made VM700T Option 21 Camera Measurements User Manual 2 49 Operating Basics Vertical Smear 2 50 Camera ID Camera ID displays an on screen keypad where you can enter an alphanumeric string to be used for camera identification This string appears on all displays produced by the measure ment as well as on measurement results files and screen captures It also carries over from one Camera Testing application to another so you need not re enter this string with each measurement unless you change cameras Record Record Data stores current measurement results in a data file Data Each time you touch this soft key a new data file is created and stored in a file named Shading N where N is one greater than the previously highest numbered Shading file The file names start with Shading 0 NOTE Multiple line display functionality is also supported for Copy mode but remember that the more lines displayed the more memory required f
72. nal CCIR 709 to prevent an error from occurring when the Function Key runs VM700T Option 21 Camera Measurements User Manual 2 11 Operating Basics Measured Gamma Previous Menu Measured Gamma tells the VM 700T that the camera uses the gamma measured and stored with the Gamma application Previous Menu returns to the previous menu Acquire amp Charts Submenu Special Position Macbeth Chart Custom Chart Change Acq Mode Special Position brings up a submenu to define the acquisition location Macbeth Chart sets locations to those appropriate to the Macbeth ColorChecker chart Custom Chart sets locations to those appropriate to a custom chart previously defined by the user If a custom chart has not been defined brings up other soft keys to allow a custom chart to be defined Change Acq Mode toggles the display from Continuous Acquisition to Color Measurement mode a non continuous acquisition mode In Continuous Acquisition mode you may make adjustments on the camera while continuously moni toring measured results In Color Measurement mode you may measure all colors on the chart and examine each in depth Special Position Submenu Width Color Packet Center 14 3 sec Weighting 1 00 Acq Line Continual Acq 2 12 Width sets the width of the measurement area To change the width select the soft key and turn the knob Color Packet selects the packet to redefine To change the pa
73. nfigure menu System Default NTSC files In nvram0 ConfigFiles Camera_Testing NTSC Delete Switch Create Rename Print Leave NTSC PAL File File Directory Figure 1 2 Camera Testing measurement limit menu choices 5 To modify the Camera Testing measurement parameters from the system defaults you must do the following tasks W create a new file using the System Default file as a template 1 2 VM700T Option 21 Camera Measurements User Manual Configuring the Camera Option m name the file you are creating W edit the measurement parameters in the new file as necessary W accept the edits m save the new file E Creating a Camera Testing Touch the Create File soft key The query line the top line of the display Configuration File asks you to select a file to use as a template for your new file 2 Touch the soft key of the file you want to use as a template for example System Default The screen displays a keyboard that you can use to type a name for your new file see Figure 1 3 3 Type the new file name observing the following rules and noting the special uses of some characters and keys W Spaces are not allowed in file or directory names use an _ underline or dot to separate words in a name m Forward slash and reverse slash Y are not permitted in the file name m When neither Set1 nor Set2 is highlighted you can type lowercase and up
74. nu Use N Reference Default Reference Use N Reference compares the current measurement result with the selected reference Default Reference compares the current measurement result with default reference values which are derived assuming perfect testing conditions If you are using custom charts pressing this soft key causes the VM 700T to read the custom chart reference numbers defined at configuration Meas Conditions Submenu Illum Phosphors Gamma Illum Submenu Illum D65 Illum 31K Illum 32K 2 10 Illum brings up a submenu that tells the VM 700T what kind of lighting is being used for the measurement Phosphors displays a submenu that tells the VM 700T what kind of output phosphor the camera is adjusted for Gamma brings up a submenu that tells the VM 700T what kind of gamma correction the camera uses Illum D65 tells the VM700T that the measurement is being made using daylight as a light source color temperature 6500 K Illum 31K tells the VM700T that the measurement is being made using a studio light as a light source color temperature 3100 K 100 K Illum 32K tells the VM700T that the measurement is being made using a studio light as a light source color temperature 3200 K 100 K VM700T Option 21 Camera Measurements User Manual Operating Basics Custom Custom Illum tells the VM700T that the measurement is Illum being made using a custom illuminant as a ligh
75. of each pixel for the current line To change the current line press the Select Line button and turn the knob To change the magnification of the waveform display use the Move Expand and arrow buttons as necessary and turn the knob Touching the screen sets the Move Expand button to Expand touch the screen and turn the knob to change the waveform display magnifica tion CCD Defects NTSC Sync Ext Screen amp Wfm Display Camera Camera 1 NTSC Fl CCD H Density 768 Pixels L 22 Threshold 7 mv Cntr Vid Lvl 7 6 mv Averaged 32 32 Frames Largest Defect 4 Pixels Max Dev Found 27 4 mV at F1 L 110 19 06 uSec 77 Pixels Over Threshold 15 0 20 0 25 0 30 0 35 0 40 0 45 0 50 0 55 0 uSec F1 L 110 Change Rescale Threshold H Density Meas Camera ID Record Display 7 mV 768 Pxls Parameter Data Figure 2 5 Defects Measurement screen and waveform display VM 700T Option 21 Camera Measurements User Manual 2 17 Operating Basics 2 18 Defects Menu The Bar Graph display plots the number of clusters groups of adjoining defective pixels against the possible sizes of the clusters Clusters of up to 120 pixels can be plotted You can use the knob to scroll the x and y axes of the Bar Graph display CCD Defects NTSC Sync Ext Bar Graph Display Camera Camera 1 NTSC No of Defects CCD H Density 768 Pixels Threshold 7 mv Cntr Vid Lvl 7 6 mv Averaged 32 gt 32 Frames
76. or the Copy function Interline Transfer IT type CCD cameras have photosensitive cells interlaced with transfer cells During vertical blanking photosensitive cell charge is shifted into the transfer cells which are clocked out This type of physical structure allows excess charge from the photosensitive cells to leak into the transfer cells as charges are clocked out On a TV monitor this is seen as the vertical streaks that may be observed in the display of oncoming headlights Vertical smear is measured by pointing the camera at a light source and observing the camera output on a video line far from the light source Smear is an unwanted lift in the video level on the observed line and is expressed as dB error from a reference level Since camera iris movement is involved in making this measurement the VM700T cannot make the measurement in the usual sense Instead the application offers a more suitable visual display for making the measurement The equation for deriving the dB error result is also standardized A black window chart provides the easiest method for making this measurement An 8 inch by 10 inch black card with a small aperture less than one half inch by one half inch in the middle if recommend for this purpose Light is directed through the aperture The idea for the measurement is to overdrive the light sensitive elements of the camera and test its ability to handle the excess charge For this reason the white
77. percase English alphabet characters The lowercase Set1 character set allows you to enter numerals and punctuation characters The uppercase Set1 and the Set2 character set allow you to enter various special characters and accented characters for use in non English language file names Both the Set1 and Set2 character keys and the Shift soft key lock when selected Set1 and Set2 are unlocked by touching the same key again or touching the unselected key of the pair Shift is unlocked by touching Shi ft again m A maximum of 31 characters are allowed in a file or directory name Wm Use only uppercase and lowercase letters numbers and the following punctuation characters _ underline dot minus sign plus Sign colon and tilde in names Avoid using punctuation characters other than those mentioned above in a directory or file name m Multiline directories and file names can be entered using the Return key Touch Return on the touch screen keyboard to get to the second line VM700T Option 21 Camera Measurements User Manual 1 3 Test Equipment Depot 800 517 8431 99 Washington Street Melrose MA 02176 FAX 781 665 0780 TestEquipmentDepot com Configuring the Camera Option Editing a Camera Testing Configuration Parameter 14 Please enter file name max 31 characters NeuLimit ENEE FERRE ER MER EM ERS Back UJI D 46 09 PS JODE sett Cancel set2
78. playback If a custom chart is selected during function playback chart information is read from data stored in NVRAM Using a Custom Chart You must do two things to use a custom color chart with the Colorimetry measurement 1 Position the camera correctly on the chart 2 Tell the VM700T where to make the measurements for the various colors within the active video area This section tells you how to do the following tasks m position the camera to use a custom chart W specify the number of colors on a custom chart W specify the acquisition line for a color packet W specify the measurement location within a line for a color packet W specify the measurement width in cycles for all color packets on a custom chart W specify the weighting factor for a color packet on a custom chart VM700T Option 21 Camera Measurements User Manual 2 13 Operating Basics Positioning the Camera Position the viewfinder so that its cross hairs point at the center of the chart both for a Custom Chart horizontally and vertically Adjust magnification so that the left and right edges of the image align with the leftmost and rightmost edges of chart colors There may be space remaining at the top or bottom of the viewfinder image Make the space at the top and at the bottom approximately equal Setting Up a Use the following steps to specify the number of colors on a chart the acquisi Custom Chart tion line for a color packet or the measure
79. s 5 0 MHz selects a 5 or 6 MHz low pass filter To 5 0 MHz change the frequency touch and hold the soft key turn the knob until the new frequency is displayed then release the soft key Also known as Depth of Modulation DOM this application measures wave form amplitude degradation as modulation frequency increases For camera testing this test is usually done with a frequency response chart that contains packets of square wave or sine wave bursts at various frequencies In CCD cameras aliasing is a direct result of the image sampling process The input image at frequencies above one half the sampling rate is represented only as aliased components While the camera still produces an output image the image is not a true representation of the input this phenomenon is not present in tube cameras The measurement uses charts that contain packets of sine or square wave bursts of different frequencies However for the Aliasing measurement a sine wave chart is recommended The measurement accepts any chart with six to twelve multiburst packets Because of VM700T bandwidth limitations you must note the packets that are out of the 6 MHz bandwidth in the Camera Measurement Configuration file refer to the Camera Testing Configuration file on page 1 3 If you use a frequency response chart that has no frequency packets outside the 6 MHz BW of the VM700T aliasing does not occur You may eliminate the Aliasing measurement by defining out o
80. sity is not set correctly for example if it does not correspond to the number of cells in each line of the CCD camera being tested erroneous or misleading results may occur Note that the H Density value is entered by the user not measured by the VM 700T Meas Parameter Camera ID Record Data Meas Parameter brings up the submenu used to select averaging shading filter on off and the temperature setting soft keys Camera ID brings up an on screen keypad on which you can enter an alphanumeric string to be used for camera identifica tion This string appears on all displays produced by the measurement as well as on measurement results files and screen captures It also carries over from one Camera Testing application to another so you need not re enter this string with each measurement unless you change cameras Record Data stores current measurement results in a data file Each time you touch this soft key a new data file is created and stored in a file named Defects N where N is one greater than the previously highest numbered Defects file The file names start with Defects 0 VM700T Option 21 Camera Measurements User Manual 2 19 Operating Basics Detail 2 20 Detail Setup Meas Parameter Submenu n Frames Averaged 32 Remove Shading Correct Threshold 20 0 C 68 F n Frames Averaged specifies the number of frames to average The Average range is 1 to 256 The default value is 32 To c
81. source file for one or all of the channels A B or C as needed for your measurements The following steps begin these tasks 1 Begin configuration of the Camera Testing measurement option by pressing the Configure button The screen displays a memory use indicator informa tion about instrument option versions and four soft keys touch screen buttons See Figure 1 1 2 Pressthe Configure Files soft key to begin configuration 3 The screen now displays a series of soft key options in a window Scroll the window to view all the menu choices by turning the front panel knob 4 Touch the Camera Testing soft key to enter the Camera Testing file directory The screen displays the System Default file and user files if any have been created See Figure 1 2 You can press a file soft key to view the parameters in any file but the System Default file parameters cannot be modified VM700T Option 21 Camera Measurements User Manual 1 1 Configuring the Camera Option Non volatile memory used 52416 bytes free 995904 bytes used free 5 95 VM700T Video Measurement Set Xxxxxx Xxxx Option 01 NTSC Version 2 09 Option 11 PAL Version 2 09 Option 40 Audio Version 1 05 Option 30 Component Version 1 01 Option 20 Teletext Version 1 01 Option 1G Echo Rounding Version 1 00 Option 21 Camera Testing Version 1 02 Configure Function Option Time Files Keys Key Figure 1 1 The Co
82. surements User Manual 2 51 Operating Basics Vertical Smear NTSC Sync Ext Camera Camera 1 NTSC F1 Line 31 to 46 Line 130 to 145 Line 211 to 226 i 900 19079 800 0 90 0 20 0 700 0 70 0 600 0 60 0 500 50 0 400 0 au 300 0 30 0 20 0 200 10 0 100 0 0 0 0 10 0 100 Above Aperture Aperture Below Aperture 3 2 mV 701 0 mV 3 7 mV Eq 20 log Ref White Threshold 20 log Ref Iris Smr Iris 2 Smear 20 log 700 mV 10 mv 20 log 8 0 0 0 2 dB Set Rescale Threshold Ref White Acquire Camera ID Record f Stops 10 mv 700 mv Data Figure 2 24 The Vertical Smear main menu and display Vertical Smear Menus Pressing the Menu button when the Vertical Smear application is running displays the Vertical Smear main menu The Vertical Smear menu tree is shown in Figure 2 25 Main Menu Set Set f Stops displays a submenu of soft keys where you may f Stops enter the f stop information needed for the measurement Rescale Rescale restores the display to its default scale Threshold Threshold nnn specifies the smear threshold the amount of nnn lift that can be tolerated for the measurement To change the threshold turn the knob while touching the soft key Reading is in IRE or mV Ref White Ref White nnn specifies the reference video level for the nnn measurement To change the reference video level turn the knob while touching the soft key Reading is in IRE or
83. t the magnification to align the left and right edges of the viewfinder on the edges of the color squares as shown Moderate Purple Red Yellow TENE u E E E The spacing at the top and bottom of the viewfinder image thatis off the color chart should be approximately the same Figure 2 1 A MacBeth ColorChecker chart camera setup for colorimetry measure ment m Within the Colorimetry application tell the VM 700T what light source is being used To do so press the Menu button to display the Colorimetry menu Press the Meas Condition soft key press the Illum soft key then press the soft key corresponding to the light source being used The Illum D65 soft key refers to daylight at 6500 K color temperature The Illum 31K soft key refers to studio light at 3100 K 100 K color tempera ture The Illum 32K soft key refers to studio light at 3200 K 100 K color temperature The Custom Illum soft key refers to the custom light source defined at configuration m Within the Colorimetry application tell the VM 700T what phosphor the camera uses To do so press the Menu button to display the Colorimetry menu Press the Phosphors soft key then press the soft key corresponding to the phosphor on the camera Custom EBU or SMPTE 24 VM700T Option 21 Camera Measurements User Manual Operating Basics NOTE Use the SMPTE phosphor setting to test NTSC cameras m Within the Colorimetry application tell the
84. t source The color temperature and x y and z coordinates for a custom illuminant may be specified in the Camera Testing file at configuration Previous Previous Menu returns to the previous menu Menu Phosphor Submenu EBU EBU Phosphor tells the VM 700T that the camera is adjusted Phosphor for an EBU phosphor SMPTE SMPTE Phosphor tells the VM 700T that the camera is adjusted Phosphor for a SMPTE phosphor Use this phosphor setting for testing NTSC cameras Custom Custom Phosphor tells the VM 700T that the camera is Phosphor adjusted for a customer phosphor definition Defining a custom phosphor is done in Camera Testing file in Configure mode The green red and blue x y and z values may be individually adjusted Previous Previous Menu returns to the previous menu Menu Gamma Submenu Linear Linear Gamma tells the VM 700T that the camera does not Gamma perform any gamma correction Nominal Nominal CCIR 709 tells the VM700T that the camera uses a CCIR 709 gamma correction factor of 0 45 the CCIR 709 standard NOTE The name of this soft key has changed This soft key was previously called Nominal Gamma The remote soft key name is now Nominal CCIR 709 If you have a previously written Function Key file that includes the use of the Nominal Gamma soft key from Version 1 00 or Version 1 01 of the Camera option and you are putting it into the VM 700T Camera option you will have to edit that Function Key file to read Nomi
85. te command 3 2 get and set keywords 3 6 3 7 get command 3 2 getresults command 3 3 hardkey command 3 3 set command 3 4 show command 3 4 softkey command 3 4 Remove 1 Shading 2 39 Remove 2 Shading 2 39 Remove Shading 2 20 2 27 Rescale 2 9 2 19 2 22 2 27 2 33 2 39 2 49 2 52 Rescale to nnn 2 45 RETMA registration chart 1 10 S Save As Custom Ch 2 13 Set Default 2 35 2 54 Set f Stops 2 52 Setting Up a Custom Chart 2 14 Shading description 2 47 menus 2 40 Shading Comp 2 39 Shading Fit 2 40 Show 1 2 Reference 2 34 Show Max Lines 2 49 Sine wave Multiburst chart 1 10 SMPTE Phosphor 2 11 Smr Iris f nn n 2 54 soft key naming exceptions 3 6 soft keys Done 1 4 System Default 1 3 Source 2 40 Source Selection Video file 1 8 2 2 Source Selection Video file 1 1 Special Position 2 12 2 34 2 40 2 53 Spectrum 2 27 Standard 14X19 2 46 Store 1 Shading 2 39 Store 1 2 Reference 2 34 Store 2 Shading 2 39 Store N Reference 2 10 Store Reference 2 9 2 33 System Camera Testing Option 1 5 system default file 1 1 Index 3 Index System Default soft key 1 3 T test charts 1 10 Threshold 2 19 Threshold nnn 2 52 U u 2 6 Unified Weighting 2 28 Use 1 2 Reference 2 33 Use N Reference 2 10 V V LinePos 2 22 v 2 6 vertical blinds effect 2 23 Index 4 Vertical Smear description 2 50 display 2 51 menu 2 52 set
86. te input The Shading measurement requires no charts or special setup conditions Shading has two modes Continuous Acquisition and Average Continuous Acquisition mode lets you adjust camera circuitry while observing the shading effect In this mode each frame of video is acquired processed and displayed Average mode selected with the Average hard key is better for precise measurements but it is not suitable for use while adjusting the camera Up to 32 frames of data can be averaged When the selected number of frames are averaged acquisition stops and you can examine the stored data VM700T Option 21 Camera Measurements User Manual 2 47 Operating Basics Shading Setup Shading Display 2 48 The shading measurement accepts input in any video format Each channel is acquired and measured separately using the Source Selection hard keys Figure 2 22 shows the Shading application display Horizontal and vertical shading line rate and field rate are displayed in two graphs Measurement results are presented in the text readout and include vertical shading maximum and average horizontal shading and horizontal shading on the selected line The results are displayed as percent error of peak white the reading is in mV Dashed lines show within the window where the vertical shading data is sampled and which line the horizontal shading shows and where text informa tion originates Shading NTSC Syne Ext Fl L 137
87. ter Zones No Graticule Graticule Graticule Charts Submenu Ball Standard Custom Verl HtHoriz Chart 14X19 Chart Lines Lines 12 to 40 9 to 40 Figure 2 21 Geometry and Registration measurement menu tree Main Menu Frame Chart Rescale to nnn Measure Graticule Frame Chart forces acquisition of a data frame for accurate measurement of chart location relative to the camera Rescale to nnn centers and rescales the display to some percent of the active video area The percent of area displayed is selected by touching the Rescale soft key and turning the knob Measure displays a submenu to select Geometry measured on channel A or Registration measured on channels B or C The Registration soft keys become visible only after the Geometry measurement completes successfully The Measure submenu also includes the cursor mode soft key Graticule displays a submenu to select the desired graticule Different graticules are appropriate during different phases of measurement VM700T Option 21 Camera Measurements User Manual 2 45 Operating Basics 2 46 Charts Charts displays a submenu from which you may select the chart to be used for the measurement A custom chart can also be defined using this submenu Camera ID Camera ID displays an on screen keypad on which you can enter an alphanumeric string to be used for camera identifica tion This string appears on all displays produced by the measurement as well as on meas
88. th Camera Testing measurements Refer to the VM700T RS 232 Interface Programmer Manual for further information on remote control of the video measurement set If you have Option 48 the GPIB interface option installed refer also to the VM700T Option 48 GPIB Interface Programmer Manual for added information on GPIB remote operation AA AAA Configuring the Camera Option EA AENA Configuring the Camera Option The approach to configuring the Camera_Testing measurement option of the VM700T Video Measurement Set is similar to that used for the other video functions A series of files and directories provide default parameters that the VM700T uses to measure video signals If the parameters in the System Default file are acceptable the VM 700T uses them if this file is the selected file for making measurements on the input video signals If your application requires parameters other than the defaults supplied with the VM 700T you can configure the Camera_Testing option to suit your testing requirements Creating new Camera Testing Files To configure and use new parameters in Camera_Testing measurements you must perform these tasks W Create your own Camera Testing file for example CamLimits and configure it with your parameter values W Create your own Video Source file for example CamSource and select the CamL imi ts file as the limits file to be used m Configure the Source Selection Video file to select the CamSource file as a
89. the following m The source selection hard keys are used to select and measure each channel separately The application accepts GBR color difference YPbPr composite video but does not distinguish between the different formats m Use the VM700T Waveform application to set the average voltage level of the signal with the camera pointed at an evenly illuminated white field The camera should be defocused so that any possible light blemish is not picked up For NTSC measurements for the white field set the average voltage level to 50 IRE For PAL measurements set the average voltage level to 350 mV With the camera lens capped black check that the voltage level is above the black clip VM700T Option 21 Camera Measurements User Manual Operating Basics NOTE Make this measurement twice once for black camera lens capped and once for white camera camera pointed at an evenly illuminated white field Defects Display Figure 2 5 shows the Defects measurement screen and waveform display Figure 2 6 shows the Defects measurement bar graph display The screen part of the screen and waveform display shows all defects found in the tested video area For NTSC the tested area starts at 11 usec from the leading edge of sync and extends for 49 5 usec For PAL the tested area starts at 11 6 usec from the leading edge of sync and extends for 49 5 usec The waveform part of the screen and waveform display shows the measured voltage
90. ts default scale Shading Comp displays a submenu where you may measure store and remove the shading on the lines where gamma is measured An evenly illuminated white field is necessary to store and remove the shading effect Display brings up a submenu where you may select the desired displays You can choose overlay or parade graphs different sources and how each source is graphed Acquire amp Charts displays a submenu where you may specify the acquisition location type of chart used and the block of lines and index step for the measurement Camera ID brings up an on screen keypad on which you can enter an alphanumeric string to be used for camera identifica tion This string appears on all displays produced by the measurement as well as on measurement results files and screen captures It also carries over from one Camera Testing application to another so you need not re enter this string with each measurement unless you change cameras Record Data stores current measurement results in a data file Each time you touch this soft key a new data file is created and stored in a file named Gamma N where N is one greater than the previously highest numbered Gamma file The file names start with Gamma 0 Shading Comp Submenu This submenu provides soft keys that let you store the current display to compensate for shading Store 1 Shading Store 2 Shading Remove 1 Shading Remove 2 Shading Store 1 S
91. tus of the toggle The convention for naming toggle keys is to use the function name with appropriate capitalization up to but not including the colon NOTE The name of one of soft keys in the Colorimetry application has changed That soft key Nominal Gamma has changed to Nominal CCIR 601 and the remote soft key name is now Nominal CCIR 7009 If you have a previously generated Function Key file that includes the use of the Nominal Gamma soft key from Version 1 00 or Version 1 01 of the Camera option and you use it with the VM 700T Camera option you will have to edit that Function Key file to read Nominal CCIR 700 to prevent an error from occurring when the Function Key runs Table 3 2 Exception Soft Key Names for Option 21 Remote Soft Key Name Screen Soft Key Name Defects Set Threshold Threshold Set Temperature nn n C nn F Defects Rescale Rescale Colorimetry Width Cycles Width Packet Num Color Packet Acquire Pos Center VM700T Option 21 Camera Measurements User Manual 3 5 Remote Commands and Keywords get and set keywords 3 6 Table 3 2 Exception Soft Key Names for Option 21 Cont Remote Soft Key Name Screen Soft Key Name Colorimetry Save As Custom Chart Save As Custom Ch Acquire_Charts Acquire amp Charts Weighting Factor Weighting Nr Chips Colors White Chip Nr Ref White Packet Measure Conditions Meas Condition Illuminant_D65 Illum D65 Illuminant 31K Illum 31K Illumin
92. up 2 51 Video Source file 1 1 1 6 1 8 2 2 editing 1 7 W Waveform 2 40 Weighting 2 12 Width 2 12 2 35 Width Default 2 54 Z Zone selection 1 5 Zones 2 47 VM700T Option 21 Camera Measurements User Manual
93. urement 0 00 eee eee eee eee 2 4 Figure 2 2 Colorimetry measurement display in Color measurement mode 2 5 Figure 2 3 Colorimetry measurement display in continuous acquisition mode cusa acea soU SURE AA a 2 7 Figure 2 4 Colorimetry menu tree 0 0 0 0 eee eee eee 2 8 Figure 2 5 Defects Measurement screen and waveform display 2 17 Figure 2 6 Defects Measurement bar graph display 2 18 Figure 2 7 Defects menu tree sss senas oa iana ee 2 18 Figure 2 8 Detail measurement screen and waveform display 2 21 Figure 2 9 Detail menu tree 2 0 0 eee eee 2 22 Figure 2 10 Fixed Pattern Noise measurement histogram display 2 24 Figure 2 11 Fixed Pattern Noise measurement spectrum display 2 25 Figure 2 12 Fixed Pattern Noise measurement expanded picture display 2 26 Figure 2 13 Fixed Pattern Noise menu tree 00 0 000 2 26 Figure 2 14 Frequency Response Measurement GBR output display 2 30 Figure 2 15 Frequency Response Measurement YPbPr output display 2 31 Figure 2 16 Frequency Response menu tree eese eese 2 32 Figure 2 17 Gamma main menu and display 000 2 37 Figure 2 18 Gamma menu tree 02 eee 2 38 Figure 2 19 Geometry and Registration display in Frame Chart mode 2 43 Figure 2 20 Geometry and Registration display in Geometry measurement MOdE isses ep a ERE 2 4
94. urement results files and screen captures It also carries over from one Camera Testing application to another so you need not re enter this string with each measurement unless you change cameras Record Record Data stores current measurement results in a data file Data Each time you touch this soft key a new data file is created and stored in a file named Geometry Registration N where N is one greater than the previously highest numbered Geometry and Registration file The file names start with Geometry Registration 0 Measure Submenu Geometry Geometry Ch A starts the Geometry measurement which is ChA made against an absolute reference Registra Registra Ch B measures channel B registration against Ch B channel A Registra Registra Ch C measures channel C registration against Ch C channel A Center Center Cursor centers the cursor on the chart Cursor Cursor Cursor activates Cursor mode allowing you to move the cursor on the chart display and read horizontal and vertical error at the cursor location Charts Submenu Ball Chart Ball Chart selects the Ball Registration chart for the measurement Standard Standard 14X19 selects a standard 14 x 19 chart for the 14X19 measurement this is the same as the EBU chart Custom Custom Chart allows you to define a custom chart when Chart neither the Ball Chart nor the EBU chart are suitable Pressing this soft key activates the Vert Lines and Horiz Lines soft keys VM70
95. want to use for example System Default 3 The screen displays a keyboard from which you can type the name for your new file Type the new file name following the rules given earlier on page 1 3 4 Press the Done key The VM 700T now displays the contents of the new file containing the video source data from the file you selected as the template You can modify the parameters in this file Changing Video Source Change the Video Source parameters using the following procedure File Parameters T T Rotate the knob to highlight the line containing the parameter you want to change in this case you would highlight the line Camera Testing System Default 2 Select a parameter by touching it touch Camera Testing System Default 3 Rotate the knob to change the parameter or value select the name of the new Video Source file you created 4 Touchthe Accept Input soft key to accept the change VM700T Option 21 Camera Measurements User Manual 1 7 Configuring the Camera Option CamSource System Default In nvram0 ConfigFiles Video Source Files NTSC NTSC Files Delete Switch Create Rename Print Leave NTSC PAL File File Directory Figure 1 4 Selecting a file to use as a template NOTE If you change a parameter and then decide you do not want to keep the change press the No change 8 Exit soft key The VM 700T verifies that you want to
96. y to the left The spectrum display plots noise level versus frequency for the line selected The expanded picture display zooms in on a small portion of the noise display of the entire active video area to allow closer examination To change the position VM700T Option 21 Camera Measurements User Manual Operating Basics or dimensions of the area zoomed in on touch the expanded picture display then use the Move Expand and arrow buttons Figure 2 11 shows the Fixed Pattern Noise spectrum display Fixed Pattern Noise Sync Ext Noise Level dB RMS Camera Tektronix Bldg 58 Studio NTSC Camera dB 0 dB 714mv 100kH 0 0 10 20 30 2 0 4 0 6 0 MHZ Noise FPN Expanded Picture 168 5 rM AA Mq ni pa ttov yel aD my Lim Shading Filters Histogram Selection 30 0 40 0 50 0 usec Rescale Camera ID Record Data Figure 2 11 Fixed Pattern Noise measurement spectrum display VM700T Option 21 Camera Measurements User Manual 2 25 Operating Basics Figure 2 12 shows the Fixed Pattern Noise expanded picture display Fixed Pattern Noise Syne Ext Noise Level 54 8 dB RMS Camera Tektronix Bldg 58 Studio NTSC Camera 100kHz 4 2MHz 2H EN 4H 098 rr 262 Noise FPN F 2 L 115 168 5 mv Remove Shading Selection 30 0 40 0 50 0 usec Rescale Camera ID Record Data Figure 2 12 Fixed Pattern Noise measurement expanded picture display Fixe

User Manual VM700T Video Measurement Set Option 21 Camera

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