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Vic-3D 2010 - Correlated Solutions

1. This tab allows selection of axis limits and Z scaling when auto scaling is turned off To control the scaling of the Z axis relative to the X and Y axes change the Z scale value Larger numbers will exaggerate the Z axis more 84 Contour Plotting tools Variable exy 1 Lagrange Range 0 0214 Show contour plot strain unit This tab allows control of the contour overlay of 2D or 3D plots To automatically scale these values to fit the data check the Auto rescale contour box To manually set the limits clear this box and enter the desired values To enable or disable the contour overlay in 3D mode select Show contour plot Use the strain unit control to determine how strain values are displayed the default is unity 1 e mm mm Color Plotting tools Color map Opacity Levels Level labels Use this tab to control the display of contour overlays The Color map box chooses the overall color set for the plot The Opacity box sets the opacity of the overlay this option affects 2D plots only The Levels box sets the n box sets the number of discrete contour levels The Level labels box controls the number of numeric level indicators Vector 85 Plotting tools E Major direction E Minor direction Displacement Skip 10 E Use solid color This tab controls display of strain and displacement vectors Major and minor strain direction vectors are displayed on 2D plots only
2. cal 003_Otif e calD04_ Ot H a cal05_Otif cal 006_0tif cal 007_0tif cal 008_0tif cal 009_0tif cal 010_0tif cal 011_0tif m cal 012_0tf e cal 013_O1tf Viewing Images Calibration images can be displayed in the workspace by double clicking on an entry in the list view on the left Alternatively clicking the right mouse button on an entry of the list view will show a popup menu providing different options one of which is View ene ve Images Data Calibration Calibration images e cal 001_0tif m cal005 Ot A cal 006_0tif cal12_Otif cal 013_0tif When viewing calibration images you can use the zoom in zoom out entries in the Edit menu or the corresponding tool buttons to change the scale of the displayed image Changing between cameras To change between the two cameras of the stereo system right click on the image viewer A popup menu will be displayed as shown in Figure 3 allowing to change between the images taken by the two cameras Toggle camera Figure 3 Right button menu in image viewer Removing Calibration Images Calibration images can be removed by selecting one or multiple images in the list view and right clicking on your selection Select Remove or Remove selected to remove images from the list 20 Calibration Calibration can be accomplished either through a stereo calibration where intrinsic and extrinsic parameters are calcula
3. Other Functionality In the right corner of the status bar at the bottom of the main window the cursor position and image grey value is displayed when the mouse is moved inside the reference image or a deformed image For 2D plots this area will show the 3D coordinates as well as the value of the current contour variable On the left side of the status bar a short description of tool buttons and menu items is displayed when the mouse moves over them In the list view on the left side of the main window some functions can be activated by right clicking Details can be found in the appropriate sections of this menu The Start Page The start page in Vic 3D gives convenient access to frequently used tasks recent projects and project type selection Eru EFE correlated Vic 3D 2010 ruoions bare J lh oan d Ara Wed Feb 10 1407 21 d rna Pia Eag l bmn al tensile z3d LU data al Tensie bending z3d D data bending example Wed Feb 10 10 20 05 2010 J 3I a mm AA Arr i 490 4 Wa T Le Drg JUUH m a a LU data TSY f SE esta LF Pow DEST Licensed to CSI Version 2010 1 0 Full Version Common Tasks This section duplicates common tasks from the menu bar Click to open a project add speckle or calibration images or view this user manual Recent Files This section contains a list of the most recently accessed projects Click on a filename to open the project Projects in Vic 3D In Vic 3D
4. Calculate _ On the displayed image click and drag select a line between two marker points that are a known distance apart After selecting the line the following dialog will appear Enter the distance between the two marker points and click Ok You can click Calculate to finish the calibration or change the selected line On completion a calibration score will be displayed 26 amp Calibration result The calibration succeeded Standard deviation of the residual projection errors was 0 00393869 pixel Do you want to accept the calibration result High numbers indicate problems with the underlying data if necessary adjust AOI or initial guess and re run Fixed Baseline Calibration The Fixed Baseline option can be used when a stereo calibration is present but has been altered for example in a stereo rig where the cameras have been bumped or disturbed by a very dynamic test It can also be used in the general case when a correlation results in a higher than expected projection error The algorithm works by assuming that the stereo baseline is fixed and that only camera rotation changed This assumption works well for most systems where the cameras are fixed in space by tripods or bars but allowed to rotate on their mounts To perform this operation select Calibrate Calibrate camera orientation Select the Fixed Baseline scale option and click the Calculate button A calibration score will be displayed to
5. To add an analog data file select File Add Files Add Data Files from the main menu To view a spreadsheet of the data double click the filename membrane 001_ 0 tif membrane 002_ tif membrane 003 Oti membrane 004_ 0 tif membrane 005 0 tif membrane D06 Oti membrane 00 O tif membrane 008_ 0 tif membrane 009 0 tif 1 213 2 179 3146 0 239258 0 377148 0 405273 0 46875 0 517578 GAA 0 561523 9 186 0 59082 0 551758 0 791016 0 629803 0 551758 052 344 0 522461 0 537109 4 78711 4 50879 11 25977 4 05957 0 908203 0 800781 0 727539 0 678711 membrane 010_ Ot 10 153 0 620117 0 581055 membrane 011_Otf 11 114 11 119 0 0 610352 Generated video files from 2D and 3D animations are added to the Video files list Double click on a video to display it in an external viewer The Calibration Tab Camera 1 i Center x 305 944 pixel ke Canter y 244 097 pixel Focal length x 2182 75 pixel Focal length y 2182 67 pixel H Skew 0 0562614 i Kappa 1 0 132158 i Kappa 2 0 143553 i Kappa 3 4 30284 Camera 2 b Center x 337 298 pixel Center y 249 914 pixel i Focal length x 2180 52 piel Focal length y 2180 58 piel i Skew 0 424 i Kappa 1 0 138176 Kappa 2 1 05382 m Kappa 3 22 7776 G Transtomiation Alpha 0 665856 deg Beta 76 6017 deg Gamma
6. only the grid spacing must be entered To remove a previously entered grid select it and click the icon The diagram below illustrates the meaning of each grid parameter 23 3 Number of dots Y eo 0880 8 eo 0 08808i0i8 OS e eee s 8 s8s e o0 8 t 88 CS A E E E E 80 ee ee3e88080 80 Offset Te vy e eeeee 8 8 e8s8 8 e eee es 6 8s e E E E E E E E HOffset Xx Length X Number of dots A Other Options To select the camera used in the calibration select from the pulldown or click the to add a new custom camera You can use this option to specify a fixed aspect ratio and or skew factor where these are known Fixing these parameters can improve the calibration in cases where target motions were limited or where they were poorly estimated To specify the distortion order of the lens use the Distortion Order spin box A value of 1 will work for most lenses but certain shorter lenses will require a distortion order of 2 or 3 to achieve the best score For high magnification situations where the center cannot be well estimated you can force the center values to the geometric center of the sensor by clicking High mag To use a certain grid orientation as the XY plane for the results coordinate system select the relevant image from the Coordinate system pulldown Use the Auto selection for a coordinate system centered about the camera rig When
7. or click 2D in the main toolbar Use the View submenu to select a planar view or revert to the default view The Contour variable submenu can be used to select the variable to display Click Change legend orientation to toggle between a horizontal and vertical legend Copy copies the current plot to the clipboard Save allows saving the plot as an image file Select Export video to save an animated video Click Detach to keep this plot static instead of updating it each time a new data file is clicked in the Data tab Editing Plot Parameters To edit other plot parameters use the plot toolbar Animating Plots 88 To animate 3D plots bring up the plot display and then use the controls on the Animation Toolbar to animate the sequence Saving the Plot The displayed plot can be saved as a BMP PNG or JPG image file by selecting Save from the context menu To copy the plot to the clipboard select Copy 89 2D Plots A 2D plot of the data can be displayed by double clicking on a data file in the list view to the left of the workspace and then clicking 2D in the main toolbar or clicking Show 2D plot in the plot context menu A plot will be displayed in the workspace as shown below TA ot i d i ha a ee wrt rT W Ba el F B els i a oe i a hie Be i T Tet E E anr a a e fe 451 11 3 65204 2 8058 1 92432 1 06005 Plot Options Plot options can be accessed by right clicking in the plot window 90
8. wW Multiply O Divide Data membrane 001_0 out Constant 2 Select file To use the data from an output file click Data and select a data file For example the selections below will subtract the Z shape from the first data file from all data files Add Subtract Multiply Divide Data membrane 01_ O out iw Constant 1 00 Select file Click Start to begin the progress bar will indicate completion For each strain and displacement variable in the dataset a derivative in time will be added and can be viewed as a contour overlay 73 Export options Calculated position and displacement data along with transformed and postprocessed variables can be exported via several different options All data export entire data set Pixel grid data sample data set on a pixel grid Metric node data place surface nodes using metric coordinates for FE comparisons Aggregate statistics export mean median deviation min max for selected files and variables 74 Exporting Data For efficient file access Vic 3D stores results in a binary data file format To use the data with other programs for post processing and plotting the data can be exported by selecting the Export item from the Data menu The dialog shown below will be displayed Export Data Output Directory D swap examples membrane Data files Al membrane 00_0 out membrane 01_0 0ut membrane 02 O out nembrane 03 O
9. 4 74146 deg i Te 307 112 mm Ty 16 7571 mm Baseline 315 5 mm This tab is a static display of the current calibration information for the project Intrinsic parameters are displayed for each camera sensor center focal length in pixels skew 1 2 or 3 radial distortion coefficients depending on selected order Extrinsic parameters are displayed for the stereo rig Alpha rotation about the optical axis Beta stereo angle Gamma tilt Tx Ty Tz relative translation of camera 1 Baseline distance between cameras resultant of Tx Ty Tz Speckle Images In Vic 3D speckle images are image or set of images taken of a specimen as it undergoes load or motion You may add one or multiple speckle images by selecting the Speckle images entry from the Project menu or by clicking the lt icon on the main tool bar If more than 300 400 images are to be added select Project Speckle image groups to add sets of images from a specified folder Select a folder to see a checklist of image prefix groups select one or more to add as speckle images Trying to add too many images directly through the normal Speckle images dialog may result in an error due to operating system limitations After adding speckle images to the project they will be displayed in the workspace and listed in the Images tab of the project bar as shown in the figure below Project a x Images Data Calibration p Speckle ima
10. Adjust for cropping adjusts for differently sized calibration vs speckle images Calibrate camera 1 2 calibrates camera parameters separately Calibrate camera orientation calibrates stereo transformation separately Data Menu The Data Menu provides the following functions Start analysis shows the Run dialog to begin 3D analysis Coordinate tools shows a submenu to allow coordinate system manipulation Markers allows exporting or fitting coordinates to marker data Export various options for exporting full data set or reductions Plot Menu The Plot Menu provides the following functions New plot adds a new plot window to the work space 2D Plot changes the currently selected plot to 2D overlay mode 3D Plot changes the currently selected plot to 3D plot mode Inspector allows choice of various data inspection tools Window Menu The Window Menu provides the following functions e Cascade organizes all MDI windows in a cascade e Tile tiles all MDI windows Help Menu The Help Menu provides the following functions e User manual show this manual e About show version information Main Toolbar The buttons on the main toolbar control commonly used Vic 3D functions From left to right File tools e New project e Open project e Save project e Add speckle images e Add calibration images Postprocessing tools shows a submenu to choose from various postprocessing calculations rH Calibrate ext
11. Show 3D plot D0427 Show camera 2 0 583111 Statistics 1 22396 Contour variable 1 96482 Change legend orientation 2 50567 Copy 3 14652 save 3 78738 Export video 4 49993 5 06909 5 704 6 35079 To switch to a 3D plot select Show 3D Plot from the context menu or click 3 D in the main toolbar Click Show camera 2 to change the underlying speckle image to the other camera view Click Statistics to view a summary of data for the current image for the currently selected contour variable The Contour variable submenu can be used to select the variable to display Click Change legend orientation to toggle between a horizontal and vertical legend Copy copies the current plot to the clipboard Save allows saving the plot as an image file Select Export video to save an animated video Click Detach to keep this plot static instead of updating it each time a new data file is clicked in the Data tab Editing Plot Parameters To edit other plot parameters use the plot toolbar Inspector Tools Tools for probing and extracting data are located in the Inspector Toolbar and can also be selected by clicking Plot Inspector in the main menu bar 91 Inspector toals E IZLI From left to right the tools are e Pan Select Pans around the contour image when zoomed in selects existing extract points To select an item click on the small square handle e Inspect point select this tool and click to probe at
12. all the files and information associated with a test are stored in a project Initially projects are blank Before completing a Vic 3D analysis the project must contain One or more speckle images including a reference image A set of calibration images A calibration One or more areas of interest Note Adding speckle and calibration images to the project adds them by filename reference only they are not copied or moved on the disk When you run a Vic 3D analysis the output files are stored on a disk and added by reference to the project file If the project file is not saved or if the data files are manually removed they will remain on the disk In addition to the items above you can also choose to add auxiliary data references to the project file e Generated video clips e Analog data files from Vic Snap Notes e In general it s good practice to save project files often to avoid losing changes e Vic 3D 2009 uses a new z3d project file format Older v3d files may be opened but not saved e Once a calibration is performed and saved in the project file the calibration images may be discarded if desired All the data calculated in the calibration routine is stored numerically in the project file The Project Toolbar The plot toolbar is displayed at the left side of the work area by default It contains information about image files data and calibration for the current project The Images Tab sa images membra
13. analog data values may be selected for either axis Extracting the Data After selecting the data files and variables to extract push the Extract button to extract the data Depending on the size and number of data files this might take some time and a progress indicator will be shown to indicate the extraction progress After data extraction the Plot tab will become active and the window will appear as follows 97 Edraction X Values File Number ia Y Values W tf Plot Style Points Lines Lines and Paints File Number 0 0 7 15 200 7 800 30 400 You can select from available variables for both X and Y axes For an extensometer extraction the available values will be DO initial distance D1 deformed distance and E strain This is not a Lagrangian strain but only the first order change in length divided by initial length term Plot Style The plot style can be selected to either show data points lines or data points and lines Saving Data The extracted data can be saved as a comma separated variable file by pressing the Save Data in the bottom left of the plot window Saving Plots The plot can be saved as a BMP PNG or JPG image file by pressing Save Plot in the bottom left of the plot window You may also copy the plot to the clipboard by right clicking on the plot area and selecting Copy 98 Real time Analysis To enter real time mode first start start Vic Snap and start the r
14. proceed click Accept 27 Adjustments for Cropping For many applications particularly in high speed imaging the images collected during the test may not have been acquired at full sensor resolution in order to increase the frame rate or to save disk space This can pose serious difficulties for normal calibration procedures For instance if a dog bone sample is used it can be advantageous to reduce the size of the image in the short dimension of the sample This can lead to images that are only a few tens of pixels in one dimension and it is practically impossible to image a calibration target in this case For such applications it is best to calibrate the camera at the full resolution of the sensor and only crop the images during the test The crop dialog seen in the figure below permits adjustment of the calibration in such cases Cropping Adjustment Pping Ag Camera 1 Horizontal offset Vertical offset Camera 2 Horizontal offset Vertical offset The dialog permits the user to enter the top left corner of the image section with respect to the calibration images for both cameras e Ifa reference image is loaded during calibration with a different size than the calibration images the adjustment dialog is automatically shown e The default values for the offsets are computed so that they are correct for most modern high speed cameras that crop from the center of the sensor e For images taken with Vic Snap t
15. third point on the xy plane this will completely define an origin and xyz orientation Reference Point If desired enter a coordinate to be designated by the reference point this will change the point designated by the first click from 0 0 0 to the specified coordinates Click Accept to calculate the new coordinate transform The following dialog appears Transformation Name Enter name for transformation Crack Origin Cra Enter a name to add the transform to the current project At this point you will be prompted to apply this transform to all current data files click Yes to apply or No to leave the data as is Applying Transformations Coordinate system transformations can be applied to data files by selecting the Apply Transformation entry from the Coordinate System Transformation menu The following dialog lets you choose which transformation to apply and which data files to apply the transformation to 45 Select Transform Data files test 000_0 out test 001_0 out test 002_0 out test 003_0 out test 004_0 out test 005_O out test 006_0 out test O07_0 out test 008_0 out test 009 0 0 inl aie MA Mm He E Invert Transformation Displacements only To invert undo the selected transformation check Invert Transformation Each transform contains 3 rotation components and 3 translation components By default only the rotation 1s applied to the U V and W displacement variables that 1s t
16. will always be 0 V mm metric displacement along the Y axis W mm metric displacement along the Z axis u v q r pixel internal raw disparity measures Generated in Postprocessing Strain Variables exx 1 strain in the X direction Positive numbers indicate tension negative numbers indicate compression eyy 1 strain in the Y direction exy 1 shear strain el 1 the major principal strain e2 1 the minor principal strain gamma 1 the principal strain angle in radians measure counterclockwise from the positive X axis Velocity Variables dU dt mm s the rate of change of the U displacement that is the velocity of a given point in the X direction dV dt mm s velocity in the Y direction dW dt mm s velocity in the Z direction dExx dt 1 s the rate of change of strain in X or strain rate in X dEyy dt 1 s the strain rate in Y dExy dt 1 s the shear strain rate Curvature Variables cxx 1 mm curvature in the X direction equivalent to 1 diameter of curvature cyy 1 mm curvature in the Y direction cl 1 mm the major principal curvature 82 e c2 1 mm the minor principal curvature e gamma 1 the principal curvature angle in radians measured counterclockwise from the positive X axis Rotation Variables e phi 1 the in plane rotation in radians Key Terms Strain the change in length divided by initial length for a solid material Fo
17. 001_0 out test 002_0 out test 003_0 out test 004_0 out test 005 O out test 006_0 out test 007_0 out test 008_0 out test 009 0 out Er poi AA Mm 2 Smoothing Options Variable Method Filter size Selecting Data Files for Processing The available data files are displayed in the Data Files list box To select which files to process click on the data file you want to select deselect This will toggle the check mark indicating whether the file 1s selected or not For convenience the buttons labeled All and None select deselect all files while Invert reverses your selection Preview To view the effects of the calculation for a single data file highlight the file and click the Preview button You may view the plot in 2D or 3D as with a standard data plot Filter size type Data is smoothed using a local filter The Method box allows selection of a smoothing method The decay filter is a 90 center weighted Gaussian filter and works best for most situations the box filter is a simple unweighted averaging filter The Filter size box controls the size of the smoothing window Since the filter size 1s given in terms of data points rather than pixels the physical size of the window on the object also depends on the step size used during correlation analysis Note by default 3D plots display deformed data the sum of each point s X Y Z location and its U V W displacement Because of this creating a smooth 3D plot like the on
18. 1 SN nite SP ix ee Eee Time 2 Exhaustive search Enabling this option will cause Vic 3D to repeat a coarse search for matches after each time the correlation fails This may result in more data recovery at the expense of vastly increased processing time Processor Optimizations This option controls the number of processors cores Vic 3D uses for analysis In most cases this will be correctly determined automatically by Vic 3D The Thresholding Tab This tab provides options for removing any data that is bad or suspect while maximizing the amount of retained data Four thresholding options are available For a typical test the default values will work very well but when conditions are unusual or substandard blur debris poor lighting etc some adjustment may be required 38 Maximum margin pixel Confidence Margin Maximum margin pixel Matchability Threshold Maximum margin pixel E Epipolar Threshold Maximum margin pixel Consistency threshold After Vic 3D analyzes the seed point the analysis is propagated to each of its four neighbors and so on Each point is fed with a prediction of its approximate match After the match is made a back prediction is calculated If the back prediction does not closely match the actual location of the prior neighbor this threshold will remove the data Confidence margin For each match Vic 3D calculates a statistical confidence region in pixels using the
19. 3 Kappa 2 0 i Kappa 3 0 5 Camera 2 i Center y 254 035 pixel Focal length x 2179 12 pixel Focal length y 2173 12 pixel H Skew 0 z Kappa 1 0 126339 i Kappa 2 0 i Kappa 3 0 S Transformation i Not calibrated To calibrate the camera orientation add a reference image to the project and select an area of interest AOI Ideally the AOI should cover as large an area of the image as possible Since the system is not calibrated you must provide an initial guess before beginning the calibration Then run the calibration You will be prompted to run a disparity analysis amp Incomplete Calibration The system is not completely calibrated Do you want to run a disparity analysis on the reference image for calibration Click Yes to continue or No to cancel Continuing will run a disparity analysis where the raw image disparities are 25 calculated but triangulation is not attempted and no 3D shape will be calculated Next select Calibrate camera orientation from the Calibration menu The dialog shown below will appear External Orientation Calibration Point distance Fmed baseline O Markers Distance gt Dimm fha ooo Markers Img membrane 001 Ott Girt Gear Threshold Image Black dots Glare reduction Adaptive threshold Threshold Smoothing j B Min size Bo al Max size 55 a Boundary SEE Camera 1 Camera 2
20. 47 Strain Calculation To calculate strain for a set of data select Data Postprocessing options Calculate strain from the main menu test 018 0 out test 019 0 out test 020_0 out test 021 O out test 022 O out test 023 O out test 024 O out Strain computation Compute principal strains Overwrite variables L Compute Tresca strain E Compute von Mises strain Filter size 15 Decay filter Lagrange exx 1 Lagrange Selecting Data Files for Processing The available data files are displayed in the Data Files list box To select which files to process click on the data file you want to select deselect This will toggle the check mark indicating whether the file 1s selected or not For convenience the buttons labeled All and None select deselect all files while Invert reverses your selection Preview To view the effects of the calculation for a single data file highlight the file and click the Preview button You may view the plot in 2D or 3D as with a standard data plot Compute principal strains Check this box to add principal strains and principal strain angle to the calculated output data Overwrite variables 48 Check this option to overwrite any existing strain calculations If this box is clear more data fields will be added to the output data set each time strain is calculated Compute Tresca von Mises strain Select these options to compute the Tresca von Mises strain criterion along with the
21. Oto finali tif fimal O50_ 0 uF Final 060_0 tiF final 070_0 tif fmal 080_ Ot final 090_0 tif Frreal 100_ 0th fimal 110_0 tif The four windows on the left show the camera 0 and camera 1 reference above and the camera 0 and camera deformed images below The small windows at the upper right show the zoomed in guess for the same four images The list at the lower left shows all the deformed images where a guess is already present the marker will be green A yellow marker indicates a guess for only one image of that pair and a red marker means no guess To add a guess drag the corresponding square from the stereo or deformed image until it is in the same spot as the reference camera 0 image at top left To make control easier you can zoom in and out of the image with the mouse wheel or by clicking the on icon and drawing a box or click the icon to zoom into the current guess area A histogram control is provided for the reference and deformed images Adjust the red bars to control image balance this can be useful for finding detail in very dark images Double click the histogram to automatically set reset the limits Below the camera 0 deformed image guess has been dragged to the approximate correct location 31 l Ki E on 5 E By mame ae Hm ig Lary Po Waa ek To check the guess click the si icon or just right click in the desired image 32 Guess found Right click to ac
22. This format provides a triangulated surface compatible with many CAD programs Matlab V4 This format provides compatibility with Matlab and many other programs capable of reading Matlab files Note that if multiple AOIs are present in a datafile unique names for each of the matrices are generated by appending increasing numbers to the variable names For instance the X coordinate for the first AOI will appear as X in the matlab file and for the second AOI it will appear as X_0 and so forth If none of the available file formats fit your needs please contact support correlatedsolutions com We will gladly implement data exporting to a format that best suits your needs 76 Exporting Grid Based Data This option can be used to export your data sampled at regular intervals spatially and for each data file to a single text file To begin select Export Grid Data from the Data menu gt Extract Grid Data Data tiles All None J jembrane 00_O out jembrane 01_O out embrane U _ Oout embrane 03_ 0 out jembrane 04_O out embrane 05_ out membrane 06_0 out embrane _Q out jembrane 08_O out embrane 09_0 out jembrane 10_0 out embrane 11_ Q out embrane 12 Q out CEF ami f I im 334343 333938 W m a 43 Sample step picels Export blanks Start Data File Selection The available data files are displayed in the list box To select which files to process click on the data file you want to select deselect
23. This will toggle the check mark indicating whether the file is selected or not For convenience the buttons labeled All and None select deselect all files the nvert button inverts the selection Options To change the sample interval in pixels adjust the Sample step value A value of 1 will sample every pixel higher values will result in a sparser data set To export blank values to the output file with a value of 0 check the Export blanks box If this box is cleared blank data points will not be present in the output file Extracting Data To begin click Start You will be prompted for an output csv file name A progress bar will appear when extraction is complete the dialog will close 7 Extracting Node Data This option can be used to export spatially sampled data to one or more CSV files membrane 00_0 out membrane 01_0 out membrane 02 O out membrane 03 0 out membrane 04_0 out membrane 05 O out membrane 06_0 out x mm mm z mm sigma pixel U mm vY mm Wi mm Preview Adding sample points Exported data is sampled based on X Y coordinates You can add a single point at a time or a line circle or grid by clicking on the appropriate button This can be repeated as many times as desired to add as many points as necessary Points on the surface will be displayed as green markers points which do
24. Vic 3D 2010 Reference Manual correlated SOLUTIONS www CorrelatedSolutions com Overview The user interface of Vic 3D has many of the familiar control elements found in other applications The image below illustrates the user interface The most commonly used functions can be accessed by clicking on tool buttons on the Tool Bar The windows such as the Reference Window and 3D Plot windows are grouped inside a Workspace The List View on the left of the main window provides a quick overview of image and data files Da Vic 3D 2009 al tensiiez3d File Edt Project Calibration Data Plot Window Help ae Oe 2olsnlnm Evornxon Plotting tools ax MP image Vieveer final 070 Oti Auto Scalng aves Contour Colorm 4 F ka Aoi Editor fin 1 000_0 tif Autorescalk coordinates f 7 Aubotescele contour _ Grew fanges oy Sa Plot final 100_0 our Deis Calbralion l 4 Lurrent dala Anahi Pout fimal 010 Pout fimal 20 out final 030_Quout fina icut Anal 05 Mout fimal 060_O out finalom hout final 080_ Dout z 4Final 080_0vout E firval i00_0 out Other data Andloyg deta Video files e Er ee i esx 1 Lagrange 0 0035 0 005275 43 0035 011625 0 0144 016375 W015 W025 025 40 02 4075 0 05035 033025 0 0457 4038375 0 0105 0 044725 0404 File Menu The File Menu provides the following functions New creates a new project Open open an existing project Sa
25. a single point The value for the currently selected contour variable at the chosen point will be displayed e Inspect line select this tool and click once to start a line click again to finish The value will be displayed at each node e Inspect polyline select this tool and click to create line nodes double click to finish The value will be displayed at each node e Inspect circle select this tool and click to define a center click again to define a disc The value at the center will be displayed e Inspect rectangle select this tool and click to define a center click again to define a rectangle The value at the center will be displayed e Extensometer select this tool and click two points this tool shows the extension change in length divided by initial length between the two points e Delete choose this tool and click on an existing point line area to remove it e Extract click to open the Extract Sequence Data or Line Plot dialogs For the line tool data will be extracted alone the line for the current image For the other tools data will be extracted at the selected point or area for each image as a time sequence Animating Plots To animate contour plots bring up the plot display and then use the controls on the Animation Toolbar to animate the sequence Saving the Plot The displayed plot can be saved as a BMP PNG or JPG image file by selecting Save from the context menu To copy the plot to the clipboard sel
26. any of these settings is changed after completing calibration a new calibration will be computed with the new option applied You can also change these options before clicking Analyze to avoid recomputation 24 Separate Calibration In some cases it may be necessary or advantageous to calibrate the cameras separately for their intrinsic parameters followed by calibrating the system s extrinsic parameters With this method the cameras are calibrated using a target and the geometry of the two cameras is determined from a speckle pattern either a speckle target or the specimen itself This method requires that two marker points with a known distance on the specimen surface are present in the images To calibrate the camera parameters separately begin by adding calibration images to the project Note Vic 3D expects image files for both cameras to be present on the disk even if only one of the two images is used Select Calibrate Calibrate Camera I from the main menu bar Proceed through the Calibration Dialog as with stereo calibration repeat for camera 2 At this point each camera is calibrated but the stereo rig transformation is still undetermined this can be confirmed by viewing the Calibration tab of the project toolbar as below Images Data Calibration Camera 1 p Centers 305 063 pixel i Center y 239 83 piel Focal length x 2183 14 pixel Focal length y 2183 14 pixel e Skew O H Kappa 1 0 12440
27. axis Analyzing speckle images Once the distortion and grid calibration is complete you can add and analyze speckle images as usual The data will be processed using the distortion map and corrected 104 Quick Start There are only a few steps involved in obtaining shape and deformation measurements from your images If you are using Vic 3D for the first time take a look at the example provided with the program Then try to go through the following steps yourself to quickly familiarize yourself with the program usage HE Add your calibration images to the project s Perform the calibration tay Add a reference image and select your area of interest Add more speckle images if applicable Y Run the correlation analysis 1 2 3 4 5 6 Plot the results If you encounter any difficulties please do not hesitate to contact our technical support department 105 What s New in Vic 3D 2010 Completely new tools for drawing AOI s and setting up initial guesses Uncertainty measures available for position and displacement data Improved parallelization for taking even better advantage of multi core processors New equation editor with user selectable constants User interface redesigned for increased ease of use Regenerate your original data at any time with the Retriangulate function Calibration process has been streamlined and simplified Strain calculation is now quicker and more accurate Tra
28. brate Distortions g Camera 1 Camera 2 Adding translation images Add translation image pairs by clicking Add images Select the desired images and click Open 101 dist 0000_0 tif dist 0001_0 tif dist O002_0 tif dist 0003 _0 tif dist O0000_1 tit dist O001_1 tit dist 0002_1 t f dist 0003_1 t f Select a Subset size that is appropriate to the speckle image For most situations the Step and Coefficients settings can be left as is Click Run to begin the analysis 102 Calibrate Distortions dist O000_0 tif dist O001_0 tif dist O002_0 tif dist 0003_0 tif dist 0000_1 tif dist 0001_1 t f dist O002 1 tif dist 0003_1 tif Parameters Subset Step Coefficients K Y When analysis is complete a message indicating success or failure will appear Click to continue and save the project to store the distortion correction map Stereo calibration Once the distortion correction is complete you can add stereo grid images and calibrate as usual The distortion order is not selectable as the distortion is corrected by the inverse mapping function 103 a Stereo System Calibration Image grid 0011_1 tif Target 9x9 0 890mm ate Previous z x Legacy method Coordinate system Default For the Camera pulldown you must select whether the magnification of the system was greater than or less than 1 1 Selecting the wrong option will result in an inverted Z
29. cept left click to reject Lo es GS e gt If the correct match is found you will be prompted to right click again to accept it If the match is not found you can check the location and try again but where severe scaling or shear is present you may need to add more details by adding more points or setting scaling shear Detailed initial guesses To add deformation to your guess you can add control points to the reference image by clicking the tai icon Up to three points can be added To specify the deformation you can drag the corresponding points in the deformed image to matching points Note that Vic 3D will not allow points that are too close together or too close to colinear Delete points by clicking mx then clicking the point to remove 33 li i i s c TE i I While you are dragging you will see that the small view to the upper right changes to reflect the transformed subset When the match is good the two views will look very similar E a i You may also drag the control points on the red rectangle to adjust the transform more directly The upper left control point affects rotation the left and bottom points control X and Y scaling and the upper right and lower right points control shearing In most cases where a manual initial guess is required you will only have to provide a stereo guess for the initial reference pair the deformation guesses will be automatically determined during th
30. ch files to process click on the data file you want to select deselect This will toggle the check mark indicating whether the file is selected or not For convenience the buttons labeled All and None select deselect all files the Invert button inverts the selection Exporting To complete the calculation click Ok You will be prompted for a filename and the data will be exported as a CSV file 80 Plotting Data Data can either be visualized as a three dimensional plot with or without color contour overlay or as a two dimensional contour plot overlayed over the speckle image The two dimensional plot provides facilities for extracting data from sequences as well as extracting slices of data 3D Plot 2D Plot 81 Output Variables Introduction During correlation and optional post processing Vic 3D presents a wide range of output data available for 3D and contour plotting extraction and export Output Variables Always Present X mm metric position along the X axis by default the horizontal axis Y mm metric position along the Y axis by default the vertical axis Z mm metric position along the Z axis by default the out of plane axis sigma pixel this is the confidence interval for the match at this point in pixels x y pixel point location in the reference speckle image U mm metric displacement along the X axis from the reference image For the reference image displacement values
31. covariance matrix of the correlation equation If the confidence region exceeds this threshold the data will be removed Matchability threshold This option automatically removes subsets that show a very low contrast 1 e subsets that don t contain very much information Increase this value to remove more data reduce to retain more data 1 e if lighting conditions were poor Epipolar threshold If a calculated match does not lie very close to the epipolar line this threshold removes the data High projection error may be caused by motion blur a poor calibration or cameras which are not rigidly mounted 39 The Post Processing Tab The tab on the dialog displays the following options Vic 3D Analysis Po Confidence margins E Compute confidence margins Strain computation Compute principal strains Filter size Filter Tensor Type Auto plane fit Checking this option will create a coordinate system based on the reference shape The origin will be at the mass centroid of all measured points with the Z axis normal to the best fit plane of the data field Leaving this option cleared wil return results in camera coordinates If custom coordinate transforms are to be used you should always start with camera coordinates to establish a consistent Cartesian reference frame rather than one that may move based on the data Compute confidence margins Check this box to add metric confidence margins for X Y and Z p
32. ction Method There four choices to select a coordinate system Best Plane Fit Select this option to calculate a transform into the best fit plane of the surface This is the same as selecting Best Plane Fit from the coordinate transform menu Select Origin Use this option to designate an origin for the coordinate system while leaving the orientation unchanged Simply click Select Origin and pick a point in the image This point becomes 0 0 0 in the 44 x y z coordinate system The orientation of the axes will be determined from the best plane fit This transform is useful when a specific point in the image is a convenient reference origin for example a notch in the specimen Origin and x axis Selecting this option allows the designation of the coordinate origin as well as the x axis After selecting click a point in the image to become the coordinate origin Click a second point to indicate the direction of the positive x axis The direction of the y axis will be determined from the best plane fit This transform is useful when both a specific origin point and an orientation are desired for instance the origin could be a crack tip and the axis could be the direction of the crack opening 3 point selection This option allows selection of an origin and the complete orientation of the axes Select a point to become the origin Select a second point to indicate the direction of the x axis Finally select a third point to indicate a
33. ctly as in the standard Vic 3D mode Running the analysis To being the real time analysis click the green Start Analysis button in the toolbar or select Data Start analysis Incoming images will be analyzed and transferred in sequence as fast as the processor and transfer speed allow Analysis options Correlation options may be adjusted before or during the analysis If the analysis 1s already in process the changes will not take place until you restart the correlation Pausing the analysis In order to make changes to coordinates and contour levels it may be helpful to pause the analysis by clicking Pause The button text will change to Resume click to resume Notes e The data analyzed in real time mode is displayed but not saved To allow later processing and storage of data be sure to store the images in Vic Snap as usual timed capture manual capture etc e To obtain the best frame rates in Real time mode select a large step size this will result in fewer points being analyzed and more total updates per second e Select a desktop PC with 2 4 or 8 cores for maximum analysis speeds With a fast PC and a larger step size frame rates of 5 10 per second can be realized e Real time mode is available with an optional module 100 Calibrating distortions To calibrate a stereo microscope start by selecting Stereo microscope mode in Vic 3D File Mode Stereo microscope The following dialog appears p Cali
34. dinate tools The calculated cloud of XYZ positions and UVW displacements can be modified into a different Cartesian coordinate system or a polar coordinate system using these options Apply transformation applies a previously saved transformation to selected data files Best plane fit fits the data to the approximate plane of a selected data file Select coordinate system select an origin X axis direction or XY plane Import from project file bring in a transform saved in a different Z3D or V3D project file Input manually enter a transform in terms of angles or specify a transformation matrix Rigid transform from displacements calculate a transform from the displacement between two images Compute cylinder transformation select a polar coordinate system for nearly cylindrical surfaces Apply cylinder transformation apply a saved polar coordinate transform 43 Coordinate System Selection Coordinate system transformations can be selected based on the 3D data contained in the reference data file To efficiently use coordinate transformations make sure to disable automatic transformation during data analysis see Coordinate Transformation for details To select a coordinate system select Data Coordinate Transformation Select coordinate system from the main menu bar The following dialog will be displayed Best fit plane O Select origin Origin and x axis 3 point selection Reference Point Sele
35. e correlation process To help this work as smoothly as possible take many images and keep image to image displacements small also place start points in lower motion areas as described above 34 Running the Correlation To run the displacement analysis select the Run Correlation entry from the Data menu or press the yi button on the tool bar The File Tab The tab on the dialog displays the following options Vic 3D Analysis Post races Select file a A test 001_0 tif test 002_0 tif test 003_0 tit test 004_0 tif test 005_0 tif test 006_0 tif test 007_0 tif test 008 O tit Output directory T Backup existing files Selecting Images The deformed images to use for correlation analysis can be selected from the list box on the dialog Selected images are indicated by a check mark Above the list box buttons are available to select deselect all image files contained in the list box To select 1 data file from from every 2 5 10 or n right click in the file list and choose the desired option If no images are selected only the reference image is analyzed Backup copies When this option is checked Vic 3D will make backup copies of existing output files by replacing their file extension with bak Output directory The directory in which the output files are stored can be selected by clicking the folder icon 35 The Options Tab The tab on the dialog displays the following options dp Vic 3D Analy
36. e above requires smoothing both Z and W 68 Mapping External Data The software supports mapping of externally acquired data from calibrated area sensors onto data files e g to provide full field temperature distribution data using infrared cameras The mapping process requires a calibration for the external camera that is properly registered with the stereo system calibration In order to ensure that the external camera is registered to the same coordinate system at least one of the calibration target images must be acquired in the same orientation and chosen as the reference during the calibration process See camera calibration for details To map externally acquired area data onto a data sequence select Data Postprocessing options Map external data from the main menu Map external data Variable variable rane Variable descptn Camera id Equation v 197 436 83 Files File extension 2 tif membrane 00_O out membrane 00_2 tif membrane 01_O out membrane 01_2 tif membrane 02_0 0ut membrane 02_2 tif membrane 03_0 out membrane 03_2 tif membrane 04 O out membrane 04_2 tif membrane 05 0 out SE membrane 05_2 tif ie membrane 06_2 tif membrane 07_0 out tif a FON membrane 08_2 tif br ma membrane 09_2 tif e membrane 10 O out 02 ve i Gl Output variable Enter a unique label for the variable name e g T for a temperature value as well as a descripti
37. e and click the Preview button You may view the plot in 2D or 3D as with a standard data plot Calculate principal curvatures Check this box to add principal curvatures to the x y curvature data Overwrite variables 64 Check this option to overwrite any existing curvature calculations If this box is clear more data fields will be added to the output data set each time strain curvature is calculated Filter size type Calculated curvatures are using a local filter The Filter box allows selection of a smoothing method The decay filter is a 90 center weighted Gaussian filter and works best for most situations the box filter is a simple unweighted averaging filter The Filter size box controls the size of the smoothing window Since the filter size is given in terms of data points rather than pixels the physical size of the window on the object also depends on the step size used during correlation analysis 65 Rotation Calculation To calculate local in plane rotation for a set of data select Data Postprocessing options Calculate in plane rotation from the main menu Local rotation computation membrane 09 O out membrane 10 O out membrane 11_0 out membrane 12_0 out membrane 13_0 out membrane 14 0 out membrane 15 0 out membrane 16 0 out membrane 1 O out membrane 18 O out Parameters Overwrite variables Filter size Filter phi rad 15 filter 0 054 Selecting Data Files for Processing The a
38. e name with the purpose of substituting it For example if the data files from Vic 3D are named tension xxx_O out and the external data files are named temperature xxx_2 mat enter tension in the regular expression field and temperature in the substitution text field Update The Update button can be used to verify that the files from the external sensor can be located properly When the update button is clicked the software will populate the list box to the right of the data file list box with the corresponding image file names from the external camera Existing files will be shown in green while missing files are shown in red Selecting Data Files for Processing The available data files are displayed in the list box on the bottom left of the dialog To select which files to process click on the data file you want to select deselect This will toggle the check mark indicating whether the file is selected or not For convenience the buttons labeled All and None select deselect all files while Invert reverses your selection Preview To view the effects of the calculation for a single data file highlight the file and click the Preview button You may view the plot in 2D or 3D as with a standard data plot 70 Deleting Variables User generated variables can be deleted from data files Note Use this functionality with caution Once removed variables cannot be restored other than by reprocessing To remove variables from data files s
39. e you wish to remove in the data file list box by clicking on it Then press the Rescan button to repopulate the variable list box based on the variables contained in the selected data file 71 Math Operations The Math operations dialog allows manipulation of output data by basic math operations Open this dialog by selecting Data Math Operations from the main menu bar amp Math operations Operation Add Subtract Multiply Divide Data membrane 001_O out Constant 1 00 Ea Select file le Oe 0 out membrane 00 out 1embrar e 005_ O out pent 00 mi membrane 011_0 out membrane 012_0 out membrane 013_0 out Data File Selection The available data files are displayed in the list box To select which files to process click on the data file you want to select deselect This will toggle the check mark indicating whether the file is selected or not For convenience the buttons labeled All and None select deselect all files the Invert button inverts the selection Operation Choose Add Subtract Multiply or Divide to perform the specified operation Arguments The Variable box is used to select the variable to operate on Any variable in the data set may be selected 72 To use a constant argument select the Constant radio button and enter the value For example the selections below will multiply the W displacement value from each data file by 10 Operation Arguments Add ariable
40. eal time server see Vic Snap documentation for details Then start Vic 3D and select File Mode Real time 3D Analysis You will be prompted for a server address and port Select Server Server localhost Port 20000 Recent localhost 20000 With Vic Snap running on the local PC select localhost if Vic Snap is running remotely you may enter the IP address of the acquisition PC The Port setting should be left at the default unless there is conflict Vic 3D will attempt to connect to the image server when the connection is established a live view will appear in the workspace and the real time tools will be displayed Pause Stop Calibration in real time mode Calibration must be performed outside of real time mode There are two possible routes e Calibrate in Vic Snap If a calibration is present in Vic Snap when you start real time mode it will be transferred to Vic 3D and will appear in the Calibration tab Or click Calibration in the tool set to transfer at a later point e Calibrate in Vic 3D Before beginning the test complete a standard calibration in Vic 3d and save a project file After entering real time mode select Calibration Import calibration and select the previously saved project Selecting a reference image 99 To select a reference click Reference in the real time tool set The currently displayed live image will be copied and used as reference You may draw AOI s on this image exa
41. ect Copy 92 Exporting Videos To export an animation from a 2D or 3D plot right click in the plot and select Export Video If the auto rescaling feature is enabled for contours or axes you will see a warning i Auto rescaling is enabled Are you sure you want to export a video When rescaling is on the animation may not appear as expected because each frame will be scaled differently Click Yes to continue or Cancel to correct the condition When complete the following dialog appears Encoder AVI membrane 001_0 out membrane 002_ out membrane 003_O out membrane 004_ out membrane 005_ out membrane 006_ out membrane 007 _0 out membrane 008_0 out membrane 009_0 out membrane 010_0 out membrane 011_0 out File Click the icon to select a filename for saving Encoder To export a video file select A VI from the Encoder drop down to export individual frames as separate numbered files select Image Sequence 93 Format Select from available compression formats options will vary based on system configuration and installed codecs Indeo R Video 5 11 works well for most Windows XP systems RGB Uncompressed videos will be high quality but very large Data File Selection The available data files are displayed in the list box To select which files to process click on the data file you want to select deselect This will toggle the check mark indicating whether t
42. elect Data Postprocessing options Map external data from the main menu Delete Vaniables Data files Variables All Invert D mm exx 1 Lagrange membrane 00_0 out eyy 1 Lagrange membrane 01_0 out exy 1 Lagrange membrane 02_0 out e1 1 Lagrange membrane 03_0 out e 1 Lagrange membrane 04_0 0ut gamma 1 Lagrange membrane 05_0 0ut membrane 06_0 out membrane 07_0 out membrane 08_0 out membrane 09_0 0ut membrane 10 O out membrane 11 0 out mombhronoi i N rait Selecting Data Files for Processing The available data files are displayed in the list box on the left of the dialog To select which files to process click on the data file you want to select deselect This will toggle the check mark indicating whether the file is selected or not For convenience the buttons labeled All and None select deselect all files while nvert reverses your selection Selecting Variables The available variables are listed in the list box on the right of the dialog Note that only user generated variables can be deleted Select the variables you wish to remove by clicking on the variable name This will toggle a check mark indicating whether the variable will be removed or not Rescanning Variables If the data files do not all contain the same variables the variable you are trying to remove may not appear in the list box when the dialog is shown In this case highlight the data file that contains the variabl
43. electing any of the options in the value combo box will set the constant to that value Creating and editing functions and constants 52 New functions and constants can be created and existing ones can be edited Click on the Edit button to open up the Edit Functions dialog y Edit Functions 4 Displ Magnitude V D mrm 4 Computed Thickness Thickness mr Thickness Ratio 1 C Material Thickness All available functions and constants are listed Constants local to a function and the outputs of a function are listed underneath the function they belong to The four buttons underneath the list allow for the creation editing and deletion of functions or constants Each of the buttons are as follows F aii Opens the wizard to create a new function L Opens the wizard to create a new constant A Opens a wizard to edit the selected function or constant If an output is selected it opens the function wizard to the edit outputs page Pas Deletes the selected function or constant If an output is selected it delete the function it belongs to Double clicking on any item in the list will open the respective wizard for editing Selecting Data Files for Processing The available data files are displayed in the list box on the bottom left of the dialog To select which files to process click on the data file you want to select deselect This will toggle the check mark indicating whether the file is selected or not For convenience
44. ernal camera calibrate for overlay of auxiliary camera data 1 e from an infrared camera E vO fl ofr e Calibrate stereo system click and hold for automatic calibration e Start analysis Histogram control Plotting tools e Switch to 2D plot 3D plot e Workspace e Marker tools e Zoom in out e Undo redo Postprocessing tools Calculate strain Calculate velocity Calculate in plane rotation Calculate curvature Apply a custom function Remove variables Retriangulate data Remove rigid motion The histogram control displays the gray level distribution for the currently displayed image The red bars on the histogram may be used to adjust the image display Double click on the histogram to automatically adjust the balance or drag the red bars to set the black and white levels manually Double click again to remove the balance adjustment The balance control is for display only and does not affect image analysis or stored images Animation Toolbar Animation tools gt E m M E se The buttons on the animation toolbar allow stepping through and animating image files or plots The controls from left to right Play begins automatically stepping through images plots Stop stops the animation Step Back Step Forward goes to previous or next image plot Loop toggles between looping from last image to first and bouncing from forward to backward animation Frame rate selects the speed of the animation
45. executed on the data Equations Variables TR 1 sqrt 1 2 e 1 1 sort i 27 e2 T Thickness TR Define Output Variables Every function must have at least one output variable The output variable is the information that is stored in the data files of the project To add one simply click Add an output There are two things to be entered for each output The first is the actual variable itself as used in equations The second is a brief description of the variable this will be displayed in plot context menus The X icon is the delete button Clicking it will delete the associated output 56 E Edit Function Define Output Variables Specify at least one output variable to be saved in the data Output variable Description Thickness mm Thickness Ratio 1 Add an output 57 Format for Equations in Vic 3D The following table lists the functions that can be used in equations in Vic 3D and the number of arguments they require The table below lists the binary operators available in Vic 3D in order of priority higher values mean higher priority TEO a o logicaror Ji for logical xor Ji a ee ee 58 a less or equal a greater or equal not equal Q o pi ess than 09 addition multiplication division raise x to the power of y oo 59 Creating and Editing Constants Constant Information The label defines what is to identify a given cons
46. ges Blmembrane 001_O tif Fi gt membrane 002_0 tif i a membrane 003_0 tif membrane 004_0 tif membrane 005_0 tif membrane 006_0tit membrane 00 _0 tif Viewing Images Deformed images can be displayed in the workspace by double clicking on an entry in the image list view Alternatively clicking the right mouse button on an entry of the list view will show a popup menu providing different options one of which is View Et oto images ip gt membrane 001_0O tif i membrane 002_ Oi membrane 003_ tit membrane 4_ tit membrane 005_ tit membrane 006_ tit Set as reference View Remove i cal 000 Dtf cal 001_Otif When viewing deformed images you can use the zoom in zoom out entries in the Edit menu or the corresponding tool buttons to change the scale of the displayed image Animating Images To animate speckle images display an image and then use the controls on the Animation Toolbar to animate the sequence Changing between cameras To change between the two cameras of the stereo system right click on the image viewer A popup menu will be displayed as shown in Figure 3 allowing to change between the images taken by the two cameras Figure 3 Right button menu in image viewer Removing Images Calibration images can be removed by selecting one or multiple images in the list view and right clicking on your selection Select Remove or Rem
47. he correct values will be read from the TIFF metadata 28 Importing a Calibration To import the calibration from an existing Z3D or V3D project file select Calibration From project file from the main menu bar You will be prompted to select a project file when complete the calibration will be imported and added to your current project 29 Initial Guess Selection In Vic 3D 2010 initial guesses will be needed very rarely Some instances where they may still be necessary include Multiple large camera angles rather than a single stereo angle Highly curved surfaces such as cylinders Large rotations between successive images Very fine or indistinct speckle patterns Poor calibration In the absence of these conditions you can generally run the correlation immediately after selecting an AOL If the correlation fails or runs very slowly an initial guess may be needed Changes from older versions Vic 3D uses a new model for start points which is a bit different than the seed point used in previous versions e Not every AOI will have a start point In many cases you can just draw the AOI and run immediately e You can now draw multiple start points They will be analyzed in parallel and analysis will proceed outwards from each one at the same time e Start points are no longer associated with a specific AOI they can be placed in overlapping AOIs or completely off the AOI Start points which are too far from an AOI will no
48. he displacement vectors are rotated with the surface but their magnitude is unchanged To apply the translation components as as well altering the displacement vectors magnitude click Displacements only Note if strains are present in the input data a warning will appear indicating that they will not be transformed It will be necessary to recalculate strain for the x and y components to be correctly aligned with the new coordinate system 46 Postprocessing tools Once the initial position and displacement fields are calculated several tools are available for processing the data Calculate strain calculate surface strain tensors Remove rigid motion removes overall object motion leaving only deformation Apply function apply arbitrary user defined functions to create new variables Restore data uses initial triangulation data to recreate original position and displacement field Calculate velocity uses time information to calculate velocity and strain rate Calculate curvature calculates local curvature over the surface Calculate in plane rotation calculates local surface rotation Smooth smooths data over a user specified diameter Map external data map data from an external source such as an IR camera Delete variables remove variables created with other postprocessing tools Combine data files combine multiple data files for display as one Apply math operation applies simple math operations to discrete variables
49. he file is selected or not For convenience the buttons labeled All and None select deselect all files the nvert button inverts the selection To begin click Export a progress bar will indicate completion 94 Line Plots Line plots can be generated by using the Inspector Tools in a 2D plot There are two types of line plots currently available e Data extracted along a line e Data extracted from a sequence of data files Line Data Extraction and Plotting The line data plot appears when the Extract button is pushed on the 2D Plot while a line is selected amp Line Plot membrane 06_0 out X Point Index eTrarane O6 O aut Y Z mm Number of paints 101 Plot Style Points Lines Lines and Points Update Save Plot Point Index 1 40 60 Adjusting the Number of Data Points The number of data points that are extracted from the data file along the line can be adjusted using the Number of Points control on the window Range Click Range to select the x y axis limits To compute limits automatically the default click Range and select the Auto scale checkbox Update When the Update box is checked the plot will update when a new file is selected in the Data tab Plot Style 95 The plot style can be selected to either show data points lines or data points and lines Save Data Click to save data from one or several extractions The following dialog will appear Export Slice Da
50. ile is selected or not For convenience the buttons labeled All and None select deselect all files the Invert button inverts the selection Postprocessing This tab contains the same postprocessing options as the initial Run dialog Select the coordinate transform confidence margin option and strain calculation here To complete the operation click Start to restore the data 62 Calculating Velocity Vic 3D can calculate rates for displacement and strain using either a specified time interval or time retrieved from a CSV log file Once the displacement fields have been calculated from the speckle images velocities may be calculated by selecting the Calculate Velocity entry on the Data menu If strain rates are desired strain should be calculated before opening the Calculate Velocity dialog This will display the dialog shown in the figure below Velocity computation Data files test 000 O out test 001_0 out test 002_0 out test 003_0 out test 004_O out test 005_0 out test 006_0 out test 007_0 out test 008_0 out E E F E E wi Constant time step Time increment s 0 2 Data File Selection The available data files are displayed in the list box To select which files to process click on the data file you want to select deselect This will toggle the check mark indicating whether the file is selected or not For convenience the but
51. ill toggle the check mark indicating whether the file 1s selected or not For convenience the buttons labeled All and None select deselect all files the Invert button inverts the selection Processing method To remove all rigid body displacement select Use average transformation This will calculate the average 50 transformation for each image and invert it to obtain an image with an average displacement rotation of 0 Only object deformation will be reflected in the transformed U V and W displacements This is useful for visualizing displacement fields in tests where deformation is obscured by larger rigid body motions To keep a single point stationary select Keep 1 point fixed and click the desired point in the image Only points within the data set highlighted in blue may be selected With this method the selected point will become stationary with all other displacements remaining relative to this point Any initial rotation will still be present after the operation To keep three points stationary select Keep 3 points fixed then click three desired points in the image to define the fixed points With this method all displacements and rotations will be relative to the three selected points which will become stationary The point and three point displacement options are useful for 1 e determining deformation of a test subject relative to fixed mounting points or standoffs If the three points you select are in three diffe
52. mplete new nodes are added to your AOI these may be moved like other nodes Choosing the Subset and Step Size The subset and step size can be selected after an area of interest is created Both are adjusted using the spin boxes in the AOI Toolbar Subset 17 E Step 3 a The subset size controls the area of the image that is used to track the displacement between images The subset size has to be large enough to ensure that there 1s a sufficiently distinctive pattern contained in the area used for correlation If you change the subset size you will see the current size illustrated by a grid briefly displayed on the AOI To have Vic 3D suggest a subset size click the icon Subset size 23 Noise level 8 00 BE aad aes E ea J 2 rig if Ai w RE By Lf pE a ka cancel Vic 3D will choose a subset size which is calculated to give an optimal match confidence of 0 01 pixel for a given assumed noise level The default of 8 works well for most cameras To accept the suggested 16 size click Ok to return without making a change click Cancel The step size controls the spacing of the points that are analyzed during correlation If a step size of 1 is chosen a correlation analysis is performed at every pixel inside the area of interest A step size of 2 means that a correlation will be carried out at every other pixel in both the horizontal and vertical direction etc Note that analysis time varies inversely
53. nce margins checkbox in the Post Processing tab of the Run Dialog You will see three new output variables representing the 1 standard deviation confidence for each axis in mm e Images are compared to each other using a different scheme than in prior versions This will increase robustness and quantity of results in many cases 106 Technical Support If you cannot find an answer to your question in this manual please do not hesitate to contact our technical support at support correlatedsolutions com You can also find contact information at our web site at www correlatedsolutions com We will be happy to assist with topics such as Designing digital image correlation experiments Calibration Troubleshooting errors Interpreting test data Achieving optimal results Bug Reports and Feature Requests If you encounter a bug in Vic 3D please let us know about it Send a short description of the problem to support correlatedsolutions com along with any project or image files you think may help us reproduce the bug Also if you think Vic 3D can be improved by adding a particular feature you would find helpful let us know about it We will try to incorporate your requests in our future updates of the software 107
54. ne 1_ 0 tif membrane D0 _ Oi membrane 003_0tif membrane 004_0 tif membrane 005_0 tif Calibration ir images cal 000_0 tif cal 001_0 tif cal 002_0 tif cal 003_0tif i a cal 004_Otif gt cal 005_0tif e cal D06 Oif i cal D07 Oif m a cal 008_Otif gt cal 009_Otif cal O10_Otif i cal O11_Otif cal O12_Otf cal 013_Otif i cal D14 Oti i cal O15_ Ot i cal O16_Otif This tab shows all speckle and calibration images associated with the project To add speckle images select Images Speckle images from the menu bar or click the speckle images icon on the main toolbar The small red arrow indicates the reference image to set an image as the reference right click and click Set as reference To add calibration images select Images Calibration images from the menu bar or click the calibration images icon on the main toolbar To remove an image or series of images select them right click and click Remove or Remove selected The Data Tab EF Analog data H a membrane csv Video files ia eyy avi The Data tab lists all output data analog data and video files associated with the project All generated output files are added to the Current data list Output files not associated with current speckle images are added to Other data Double click on a data file to view a 3D plot Analog data from Vic Snap is listed under Analog data
55. not fall on the surface for a given data file are shown as red 78 To save a set of points for future use click the disk icon next to the file dropdown To restore from an existing file use the file dropdown or select Add File Data files Use this list to select one or more data files to extract from Variables Select the desired output variables from this list Use deformed coordinates To overlay the selected X Y points on the deformed shape check this box To overlay the coordinates on the initial shape while still exporting deformation data clear the box Preview and Export Click Preview to see the position of your points on the selected file To export the data according to your selected points click Export 19 Calculating Statistics To export statistics for calculated variables and data files select Data Statistics from the main menu bar Statistics Z Minimum Maximum Mean Median Standard deviation Data Files test 000_0 out test 001_0 out test 002 O out test 003 0 out test 004 O out test 005 O out test 006 0 out tert PUT PM at Statistics Check the desired item to include or exclude the statistic from the output file Variables Check the desired variables to add them to the calculation By default all metric variables are included while correlation and pixel variables are excluded Data File Selection The available data files are displayed in the list box To select whi
56. nsitioning from older Vic 3D versions For users transitioning from Vic 3D 2007 and 2009 the most visible differences will be in the areas of AOI creation and calibration e When creating AOI s a seed point is no longer automatically placed In most cases you can simply draw your AOI and then run your analysis Where a seed point is required you can place one or multiple start points e Inthe 3D calibration dialog you will simply pick your target and then click Analyze The rest of the process happens automatically To remove bad images you can right click directly on the score Important note Projects may be loaded from any earlier version of Vic 3D However projects saved in Vic 3D 2010 can only be loaded in Vic 3D 2010 These projects contain detailed information about settings and calibration so that you may exactly reproduce project data without having to recall thresholds and correlation settings Some other changes that existing Vic 3D users may want to explore e The equation editor has been revamped completely Save and load constants and use analog data within your equations e In past versions if you applied too many transforms or otherwise modified data the only way to get the original data back was to rerun the correlation Now you can use the Restore data option to retriangulate the original data very quickly e You can now add true metric confidence data to your correlation results Just check the Compute confide
57. on of the variable e g T Fahrenheit Camera ID Select the camera ID that you assigned during calibration of the external area sensor 69 Equation The values read from the data or image file acquired by the external sensor are passed through an equation The value read from the data file can be accessed through the variable v in the equation The default equation is simply v 1 e the values read from the file are used unmodified For details on the equation syntax please refer to equation format File name mapping In order to locate the image or data file acquired by the external camera that corresponds to a given data file you have to enter the file extension of the image data files and character substitutions if applicable Note It is highly recommended to adopt a naming scheme for external data that is consistent with the Vic 3D file naming conventions E g if the base name for the images is tension the Vic 3D image files will be named tension xxx_0 tif and tension xxx_1l tif for the first and second camera respectively It is recommended to store the images from the external sensor as tension xxx_2 tif or tension xxx_O mat depending on the file format If the above recommendation is used it is sufficient to enter the file extension preceeded by the camera ID in the File extension field e g 2 tif or 2 mat Regular Expression and Substitution Text A regular expression can be used to match any part of the data fil
58. osition and displacement The new variables represent the 1 standard deviation confidence for the position computed from the pixel confidence margin together with the camera geometry Strain Computation Checking this option performs a strain computation as each image is processed results can be viewed in the preview 40 Correlation Results After you begin the correlation the following window appears L411 4 28 Points 1 7156 Time fod Error 0 023 Iterations 1 7 Close The window contains an overview of correlation progress and reults File the progress and total number of files to analyze Points the number of data points calculated for the image Time The amount of time spent on correlation analysis in seconds Error a measure of correlation accuracy specificially epipolar projection error A high number indicates possible problems with calibration or camera synchronization Iterations a measure of how many possible matches were searched for each point Progress bar indicates the progress of each individual file as it is correlated This window also contains a preview of the output data This data may be view in 2D and 3D and manipulated as with a standard plot When the analysis is complete you may click View Report to see a summary of the above data 41 For more information on interpreting correlation results and troubleshooting errors please contact Technical Support 42 Coor
59. out embrane 04 O out membrane 05_O out membrane 06_0 0ut membrane 07 O out membrane 08_0 out membrane 09_0 out membrane 10_0 out m 5 EIRIEIEIEIEISIE 3 File Format Comma separated variable Tecplot ASCII plain ASCII STL format O Matlab format v4 File Options _ Strip blank values _ Add deformed values _ First ACI only Selecting Files for Exporting The available data files are displayed in the list box To select which files to export click on the data file you want to select deselect This will toggle the check mark indicating whether the file is selected or not For convenience the buttons labeled All and None select deselect all files 19 File Formats The data files can be exported to the following formats Comma Separated Variable Data entries are separated by commas This format is understood by most spreadsheet programs and plotting packages Variable names are stored in the data file as comma separated strings in quotation marks Exported files will have the extension csv Tecplot Used for plotting the data with Amtec s www amtec com plotting program Tecplot TM Exported files will have the extension dat Plain ASCII This format is plain space delimited ASCII text data with one data point per line Note There are no variable names in the data file and data from different AOIs is concatenated Exported files will have the extension txt STL Format
60. ove selected to remove images from the list 12 The Reference Image The term Reference Image is used in this manual to describe the image of the specimen taken while no load was applied All displacement analyses in Vic 3D are with respect to this reference image 1 e the displacements are obtained in a Lagrangian coordinate system To select a reference image right click on it in the Speckle images list and select Set as reference ai Speckle images pe gt membrane 001 _0 tif membrane 004_0 tif membrane 005_0 tif membrane 006 _0 tif Set as reference View Remove membrane 012 Ot Calibration images cal 000_0 tif H 9 cal 001_0tif After the reference image has been selected it will be indicated with a red arrow in the images list Project ax Images Data Calibration a poata mages P When the reference image is displayed the mask tool buttons become active Mask tools E E a i e Subset 29 Step 7 p W Apply to all Selecting an Area of Interest Vic 3D supports the following types of AOIs e Rectangle Points are contained in a rectangular area e Polygon Points are contained in an arbitrary polygon e Circle Automatically creates a roughly circular polygon To specify a particular type of AOI select the corresponding entry in the Edit menu or the appropriate button on the tool bar The selected AOI type will be indicated by the mouse c
61. r example a strain of 10 indicates that the material has expanded by 10 a strain of 10 indicates that the material has contracted by 10 Positive strains are referred to as tensile while negative strains are compressive Note this is a finite strain tensor and contains a quadratic term for significant strains this may result in a strain measure which is larger than the small strain indicated by a strain gauge or extensometer Principal strain the strain for a reference frame that is rotated such that shear becomes zero leaving only two strain components at 901 angles The larger strain becomes the major principal strain and the smaller becomes the minor principal strain 83 The Plot Toolbar The plot toolbar is displayed at the top left edge of the work area by default It contains options and controls for both the 2D and 3D plots Auto Scaling Plotting tools FF J Auto rescale coordinates W Auto rescale contour E Grow ranges only This tab controls auto scaling Check or clear the boxes to enable auto rescaling of either coordinate axes limits or contour overlay limits Check Grow ranges only to allow ranges to get larger but not smaller With this box checked you can animate through all images to set the limits to the minimum and maximum over all data files This is useful for producing consistent animations and videos Axes Plotting tools
62. rences Unaffected by both offset and scale in lighting e deformed subset is 10 brighter plus 10 gray levels This may be necessary in special situations However it may also fail to converge produce a result in more cases than the NSSD option Low pass filter images The low pass filter removes some high frequency information from the input images This can reduce aliasing effects in images where the speckle pattern is overly fine and cannot be well represented in the image These aliasing effects are often visible as a moire type pattern in the output data Incremental correlation With incremental correlation each image is compared to the previous image rather than the reference image This can be useful in cases of pattern breakdown or extremely high strains gt 100 This comes at the expense of an increase in noise for later images because the noise continues to add over each successive correlation Use left stereo reference By default Vic 3D 2010 compares the left to the right image only once in the initial stereo pair After this point succeeding left images are compared to the left reference and succeeding right images are compared to the right reference gt ie hae ee Pages Ge t i Bag Reference time 0 Time 1 Time 2 In prior versions both left and right images from any point in the sequence were always compared to the left reference image 37 F 4 A A y Reference time 0 Time
63. rent AOI s you will be given the option to use the entire AOI for the operation This will be useful if for example you have small AOIs on top of three separate fixed posts of a test fixture Click Compute to proceed with the computation Strain calculation Note that these transforms will not affect calculated strain nor are they necessary in order to correctly calculate strain the strain algorithm is by nature insensitive to rigid body displacements 51 Applying Functions to Data Vic 3D supports the generation of new variables based on equations applied to the data This feature can be used for instance to compute engineering strains from Lagrange strains to compute stresses from strains or to compute thinning of a strained specimen of known thickness based on the Poisson s effect or volume conservation during plastic deformation To apply function to a data sequence select Data Postprocessing options Apply function from the main menu ey Apply Function Functions Function Computed Thickness Constants Material Thickn final 010 0 out final 020 O out final 030 O out final 040 O out final 050 0 out final 060 O out final O70 O out Preview Function Select a function which you wish to apply to the data Constants Each function may have constants that are used in its equations The constants are displayed next to their current values Some constants may contain pre defined options for the value S
64. rough each image and extract the dot centers once image analysis 1s complete the calibration will be computed If the score is higher than optimal any outlying images will be discarded and the calibration computed again The final score in pixels lower is better 1s displayed in the bottom right 22 a l Score 0 013 oe epee ooo cmt Click Accept to use this calibration Results in Detail For each image a score is displayed This is the average error in pixels between the position where a target point was found in the image and the theoretical position where the mathematical calibration model places the point Good scores will be displayed in green higher scores will be red To remove a certain image from the calibration you can right click on it and select Remove Points To use points from an image which has been cleared right click again and select Extract Calculated calibration values are displayed in the tree view to the lower right Each item has a value as well as a confidence interval one standard deviation To view a report containing all the information as text click Report This report can also be copied to the clipboard and saved for later reference Grid Selection If the grid used is not listed in the pulldown click to add a new one or Edit to edit the current settings When clicking Vic 3D will attempt to automatically extract the grid information and will fill it in if found in this case
65. sis Post Processing Subset Options Subset weights Correlation Options Interpolation Optimized 6 tap Criterion Normalized squared differences E Low pass filter images E Incremental correlation E Use left stereo reference E Exhaustive search Processor Optimizations Multi processor multiccore 3 Subset weights This option controls the way pixels within the subset are weighted With Uniform weights each pixel within the subset is considered equally Selecting Gaussian weights causes the subset matching to be center weighted Gaussian weights provide the best combination of spatial resolution and displacement resolution Interpolation To achieve sub pixel accuracy the correlation algorithms use gray value interpolation representing a field of discrete gray levels as a continuous spline Either 4 6 or 8 tap splines may be selected here Generally more accurate displacement information can be obtained with higher order splines Lower order splines offer faster correlation at the expense of some accuracy Criterion There are three correlation criteria to choose from e Squared differences Affected by any lighting changes not generally recommended 36 e Normalized squared differences Unaffected by scale in lighting 1 e deformed subset is 50 brighter than reference This is the default and usually offers the best combination of flexibility and results e Zero normalized squared diffe
66. strain tensor calculation Filter size type Calculated strains are always smoothed using a local filter The Filter box allows selection of a smoothing method The decay filter is a 90 center weighted Gaussian filter and works best for most situations the box filter is a simple unweighted averaging filter The Filter size box controls the size of the smoothing window Since the filter size 1s given in terms of data points rather than pixels the physical size of the window on the object also depends on the step size used during correlation analysis Tensor type Select the desired strain tensor The default is Lagrangian finite strain 49 Removing Rigid Motion This tool is used to remove rigid body displacement from deformed images leaving only deformation components of displacement Once the displacement fields have been from the speckle images this tool can be started by selecting Data Remove displacements amp Femove 1gi ron OOOO Method Use average transformation Keep 1 point fixed Keep 3 points fixed Data files A None Invert final 000_0 0ut final 010_0 out final 020_0 out final 030 _0 out final 040 0 out final 050 O 0ut final 060 O 0ut final 070 O out final 080_0 0ut final 090_0 0ut final 100_0 0ut Data File Selection The available data files are displayed in the list box To select which files to process click on the data file you want to select deselect This w
67. t be used for anything Placing start points Generally it is best to place a start point in the area of the image that undergoes the least amount of motion during the test For instance if a specimen is tested in a tensile frame the start point should be placed as close to the stationary grip as possible Placing the seed point this way will help ensure fully automatic correlation If a specimen is expected to fail or crack it may help to put start points on either side of the specimen so that once failure occurs there will still be a start point on both surfaces For very large transformations or rotations it can be very helpful to place fiducial marks on the surface This can be integrated into a printed pattern or simply drawn on the surface with a marker These marks may be located much more easily than the random pattern especially if 1 e one image is rotated 180 degrees from the other To place the start point click the Q icon in the Mask tools box from the AOI Editor Once a start point is placed Vic 3D will start looking for initial guesses in the background If initial guesses are not automatically found manual editing may be required Editing initial guesses 30 The initial guess dialog can be accessed by double clicking on the 9 icon in the AOI editor or right clicking and selecting Edit guesses The Initial Guess Editor will appear iy Invial Guess ditor fmal 010 D t Fial O20_0 0F firval O30_
68. ta Options Variables Organize files Write header Data Files All membrane 00_0 out membrane 0i_0 out membrane 02_0 out membrane 03_0 out membrane 04_0 out membrane 05_0 out membrane 06_0 0ut membrane 07_0 out Select the variables to extract and the files to include in the extraction The data may be organized by columns or rows to include a row column header which contains the name of the relevant data file select Write header Saving Plots The plot can be saved as a BMP PNG or JPG image file by pressing Save Plot in the bottom left of the plot window You may also copy the plot to the clipboard by right clicking on the plot area and selecting Copy Sequence Data Extraction and Plotting The sequence data extraction window appears when the Extract button is pushed on the 2D Plot while a point circle or rectangle is selected 96 Extraction Data Files M membrane 001_ 0 out membrane 002 out membrane 003 0 out membrane 004_ Oout membrane 005 out membrane 006_ out membrane 00 O out Dal i J Vanables M x Y z L correlation 6 000 Selecting Data Files The data files used for extraction can be selected in the listbox in the top left of the window on the Extract tab Selecting Variables The variables to extract from the files can be selected in the listbox in the bottom left of the window on the Extract tab If an analog data file is present time and
69. tant in an equation The scope defines whether or not the constant 1s accessible to all functions Global or if it is only accessible to a specific function The description is used to note the purpose of the constant Create EqConstant in l Constant Information Specdfy basic information about the constant Label Scope Global Description Young s Modulus commie iia nina Define Options Defining options is not necessary but it can be helpful for instance a preselected group of material property constants as in the example below There are two values for each option a description and a value 60 Define Options Specify options Options Aluminum 6 9e 10 X Add an option 61 Retriangulating Data After data has been manipulated through math operations or postprocessing it is possible to restore the initial position and displacement field without rerunning the correlation To start select Restore data from the postprocessing menu or toolbar Triangulation computation final 000 O out final 010_0 out final 020 O out final 030 O out final 040 O out final 050_ 0 out final 060 O out final 070_0 out final 080 O out final 090 O out final 100 O out Data File Selection The available data files are displayed in the list box To select which files to process click on the data file you want to select deselect This will toggle the check mark indicating whether the f
70. ted together or a separate calibration Stereo Calibration For most applications stereo calibration is used The calibration target is imaged simultaneously in both cameras and the synchronized target images are used to fully calibrate the system in one step Separate Calibration In certain applications a stereo calibration is not practical In this case a separate calibration method can be used In this method each camera acquires target images separately These images are used to calculate intrinsic parameters for the cameras A static speckle image is then used to establish the camera orientation For this method the speckle image must contain markers or fiducial points with a known distance between them Cases where separate calibration will be useful include Very large fields of view Cameras that cannot be synchronized Cameras that must be moved after calibration Certain complex mirror setups 21 Stereo Calibration cs To begin select the Calibrate stereo system entry from the Calibration menu or click on the icon on the tool bar The calibration dialog will appear Griho selects a Edit araa o l i re cDo eadi n E caii 6 P E Fi a F Camera Genenc wie wende 1 S Highmag D Ceondnate system auto Regart rt Select the grid you used from the Grid pulldown and click Analyze to process the images and calibrate Vic 3D will go th
71. the buttons labeled All and None select deselect all files while nvert reverses your selection Preview To view the effects of the calculation for a single data file highlight the file and click the Preview 53 button You may view the plot in 2D or 3D as with a standard data plot 54 Creating and Editing Functions Function Information The first page of the function wizard is for entering a brief description of the function and the scope in which the function is stored The Global scope option stores the function in the program settings where it can be used by any project The Project stores the function in the project itself If the project option is selected then the function and it s local constants are stored in the current project and is only accessible by the current project Edit Function Function Information Specdfy a brief description of the purpose of the function Description Computed Thickness Scope Global C Project Define Equations The next page is where the actual equations are entered There can be multiple equations and they are separated by a new line each should be in the form variable function definition Double click on a variable at left to insert it at the cursor After you enter your equations and click Finish any errors will be announced and corrections will be required before proceeding 55 Edit Function Detine Equations Specify one or more equations to be
72. tons labeled All and None select deselect all files the Invert button inverts the selection Velocity Calculation If a Vic Snap CSV log file exists for the project you may select Time From File from the dropdown and select the file if necessary Otherwise select Constant Time Step and enter the known time increment or select Constant Frame Rate to enter a known frame rate for 1 e a high speed camera Click Start to begin the progress bar will indicate completion For each strain and displacement variable in the dataset a derivative in time will be added and can be viewed as a contour overlay 63 Curvature Calculation To calculate local curvature for a set of data select Data Postprocessing options Calculate strain from the main menu amp Curvature computation Data files All None Invert ref b 0000_0 out Curvature parameters Calculate prindpal curvatures Overwrite variables Filter size Filter cyy 1 mm 15 filter Selecting Data Files for Processing The available data files are displayed in the Data Files list box To select which files to process click on the data file you want to select deselect This will toggle the check mark indicating whether the file is selected or not For convenience the buttons labeled All and None select deselect all files while Invert reverses your selection Preview To view the effects of the calculation for a single data file highlight the fil
73. ursor After selecting the AOI type move the cursor to the desired position in the reference window and click the left mouse button You can now move the mouse to the next position e g the end of the line or the second corner of the rectangle Clicking the left mouse button again will complete the AOI selection for all AOI types except polygons For polygon selection a double click 1s used to specify the last point of the polygon Aoi Editor final 000_0 tif Editing AOIs To edit an existing AOI select the Pan Select tool Mouse over any of the white nodes in your AOI the mouse cursor changes to indicate node movement Click and drag to move You can delete a node by clicking the mx icon then clicking the desired node If the merge polygons icon S is selected any overlapping polygons will be merged with each other If the icon is not selected overlapping AOIs will remain separate Cutouts For rectangular and polygon AOIs the scissors tool can be used to cut areas from the AOI This feature is most commonly used if the specimen has cracks holes or other areas where correlation is impossible 15 To cut an area from an AOI click the scissors button on the tool bar or select Edit Cut region The selection of the area to be cut works like selecting a polygon AOI 1 e corner points of a polygon can be added by single clicking the left mouse button and the last point 1s specified by a double click Once the cut is co
74. vailable data files are displayed in the Data Files list box To select which files to process click on the data file you want to select deselect This will toggle the check mark indicating whether the file is selected or not For convenience the buttons labeled All and None select deselect all files while Invert reverses your Selection Preview To view the effects of the calculation for a single data file highlight the file and click the Preview button You may view the plot in 2D or 3D as with a standard data plot Overwrite variables Check this option to overwrite any existing rotation calculations If this box is clear more data fields will be added to the output data set each time rotation is calculated Filter size type 66 Calculated rotations are smoothed using a local filter The Filter box allows selection of a smoothing method The decay filter 1s a 90 center weighted Gaussian filter and works best for most situations the box filter is a simple unweighted averaging filter The Filter size box controls the size of the smoothing window Since the filter size is given in terms of data points rather than pixels the physical size of the window on the object also depends on the step size used during correlation analysis 67 Smoothing data To calculate strain for a set of data select Data Postprocessing options Smooth variable from the main menu amp smootting iO EE ee Data files test 000_0 o0ut test
75. ve save the current project Save As save the current project under a new file name Mode select a Vic 3D project type 3D realtime stereomicroscope etc Install module licenses use this menu entry to activate software modules you have purchased Quit quit Vic 3D Edit Menu The Edit Menu provides the following functions e Undo undo the last editing operation in the reference image e Redo redo the last editing operation in the reference image e AOI tools each AOI tool is selectable from this menu Project Menu The Project Menu provides the following functions e Speckle images adds speckle images to the project for analysis e Calibration images adds calibration images to the project e Speckle image groups add a group of speckle images with the same prefix Calibration image groups add a group of calibration images with the same prefix Data files adds pre existing output data files to the project Analog data adds analog data files from Vic Snap Video clip adds generated AVI files Workspace displays the 3D image correlation workspace Marker editor displays the marker tracking toolset Calibration Menu The Calibration Menu provides the following functions Calibrate stereo system calibrates the cameras and stereo rig simultaneously From project file import a calibration from an existing Z3D or V3D project file Autocorrect calibration corrects for a disturbed camera orientation calibration
76. when strain data is available displacement vectors may be viewed in 2D or 3D Skip and scale control the size and density of the vectors The use solid color checkbox causes the vectors to be displayed in a single color rather than the underlying plot color the color selector button can be used to choose this color Legend Plotting tools Format Digits These controls affect the format of the contour legend Select a Format from Number Scientific exponential notation or Best most concise method Select a number of Digits or Automatic to use as much precision as necessary 86 3D Plots A 3D plot of the data can be displayed by double clicking on a data file in the list view to the left of the workspace or by selecting a data file from the Data Plot menu A plot will be displayed in the workspace as shown below amp Plot membrane 06 0 out Z mm 23 5 22 65 21 8 Controlling the Plot To rotate the plot click and drag in the plot window To zoom in and out rotate the scroll wheel To pan around the plot click and hold the scroll wheel and move the mouse Plot Options Plot options can be accessed by right clicking in the plot window 87 Z mm 23 5 22 65 21 8 20 95 20 1 Contour variable Show 2D plot 3D view angle Show reference data Change legend onentation Copy Save Export video Detach To switch to a 2D plot select Show 2D Plot from the context menu
77. with the square of the step size 1 e a step size of 1 takes 25 times longer to analyze than a step size of 5 To cause subset and step size changes to apply to every AOI check the Apply to all box If this box is cleared subsets and steps can vary between AOIs Placing start points In some situations start points may be need for the correlation To place a start point click the Q icon The Initial Guess Selection page has more information about selecting end editing start points To remove a start point click the icon then click the start point Hints e Use the scroll wheel to adjust the size of the image e When using multiple AOIs for one image click on an AOI with the pan select tool to activate it e During AOI selection the image can be scrolled by moving the mouse outside the reference image window This will cause the image to autoscroll if the image does not fit on the display e You can use the Undo Redo buttons to undo AOI selection and other operations The Undo Redo buttons in the Edit menu will indicate what changes can be undone redone Calibration Images Calibration images can be added by selecting the Calibration images entry from the Images menu or by clicking the icon on the main tool bar After adding calibration images to the project they will be listed in the mages tab of the project bar as illustrated below H Speckle images Calibration images eee nee cal 001_0tif cal 002_Otif

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