ActivAlignment User`s Manual
Contents
1. r Execution Application x Mode Edge Pairs v Edge Grouping Execute Slaves All Edges v Edge Selection Single Run Stop 4 gt feo Edge Strength Aff FAIS Noise Lever EEE a PAE Ro widh E Error Messages Standard F Accuracy Alignment failed Please change a parameter Figure 4 4 Accessing the alignment status Private bIsAligned As Boolean If atToolResults Value handleStatus sStatusSuccess Then bIsAligned True If bIsError True Then Call ClearAlarm End If Else sErrMsg Alignment failed Please change a parameter Call DisplayMessage sErrMsg Call SetAlarm o g 2 2 lt bIsAligned False End If ActivVisionTools 3 2 Your Fast Track to Solutions 32 Tips amp Tricks Private bIsError As Boolean Private Function SetAlarm AVTView1 RunState False Light BackColor vbRed bIsError True End Function Private Function ClearAlarm Light BackColor vbGreen bIsError False End Function One has to keep in mind that AVTAlignment is executed not only when the next image is grabbed but also whenever you modify its parameters To distinguish the two cases an event raised by AVTView at the start of each execution cycle can be used to set a variable called biIsNewCycle Private bIsNewCycle As Boolean Private Sub AVTView1_CycleStart bIsNewCycle True End Sub This variable is now used together with the variable2. save the training information to modify a trained anchor uncheck this box Figure 2 2 Teaching the alignment anchor o g 2 2 lt to complete During this time AVTViewStatus displays a corresponding message Af terwards the appearance of AVTAlignmentTeach changes When you stop the application the training information is automatically saved in a file with the extension alm the file name is composed of the names of the application and of the instance of AVTAlignment e g alignment_training_AVTAlignment1 alm for this example project Whenever you start the application again the alignment file is automatically loaded If you want to use the training information for other projects as well you can save it in a separate file by clicking Save Anchor and specifying a file name in the appearing file selection box If you want to modify a trained anchor e g modify the region of interest you must unlock it first by unchecking the box v Locked Note that the anchor is unlocked automatically when you create another ROI for ActivAlignment ActivVisionTools 3 2 Your Fast Track to Solutions 12 Using ActivAlignment Visual Basic Example 2 3 Finding the Anchor Again Using or AVTAlignmentuUse allows to configure the application phase of ActivAlignment by defining the search space and specifying what is to be displayed in AVTView
3. To work with the programming interface in VB 6 0 you must first add the ActivVisionTools type library to the project s references by checking the box labeled ActivVisionTools Type Library in the menu dialog Project gt References In Visual Basic NET the ref erence is added automatically References datacode_resultaccess vbp x Available References M visual Basic For Applications Ml visual Basic runtime objects and procedures M Visual Basic objects and procedures M C IAS RADIUS Protocol 1 0 Type Library O Acrobat Ll Acrobat Access 2 0 Type Library O Acrobat Access 3 0 Type Library gt l C Acrobat Distiller O Acrobat WebCapture 1 0 Type Library C Acrobat WebCapture IE Toolbar Favorites 1 0 Type L AcrolEHeloer 1 0 Type Library z ActivVisionTools 3 1 Type Library Location C Program Files MYTec ActivVisionTools bin iS86 nt4 Activ vT Language Standard ActivAlignment 2008 04 23 4 3 Accessing Results Via the Programming Interface 29 4 3 1 Basic Principles The principal idea behind accessing the results of an ActivVisionTool is quite simple When a tool has finished its execution it raises an event called Finish sending its results as a parameter If you want to access the results all you have to do therefore is to create a corresponding event procedure which handles the event Within the Visual Basic environment you can create event procedures very easily as sho
4. Furthermore it lets you select whether ROIs are to be aligned and what happens in case the anchor is not found in an image this is described in the following chapter Preparation for the following example If you worked on the previous example you may continue using this project At design time add AVTAlignmentUse by double clicking em You may remove AVTAlignmentTeach as it can be opened by clicking into AVTView with the right mouse button and selecting Alignment Teach in the popup menu Otherwise open the project matching alignment_matching vbp Execute the application and load the image sequence board board1 seq The following steps are visualized in figure 2 3 As described in the previous section when you start an application in which you al ready trained an anchor the training information is automatically loaded Via a click on Load Anchor you can load a training file explicitly Thus you can reuse training information for multiple applications When you click Set Reference the current image is used as the reference image If you know that the object will not appear in all possible orientations you may limit the corresponding range of rotation with the slider Angle Range or by directly typing the value in the text field to the right of the slider Note that you cannot use a larger range than the one you specified in the training phase see secti
5. In this mode you can develop the image processing part of your machine vision application rapidly and easily without any programming However there is more to ActivVisionTools than the graphical user interfaces Because ActivVisionTools comes as a set of ActiveX controls it provides you with an open programming interface thereby offering full flexibility In this section we show how to access the results of alignment via the programming interface With this you can e g realize an application specific graphical user interface perform ad ditional processing on the results or send results to a special output device More examples showing how to use the programming interface e g to access evaluation results can be found in other manuals e g in the User s Manual for ActivMeasure in section 4 3 on page 30 or in the User s Manual for ActivDecision in section 3 4 1 on page 31 Detailed information about the programming interface can be found in the Reference Manual As in the previous sections the examples stem from Visual Basic 6 0 if the ActivVisionTools specific code differs in Visual Basic NET the corresponding lines are also shown for the first appearance only For other NET languages or C please refer to the Advanced User s Guide for ActivVisionTools section 1 2 3 on page 5 and section 1 3 4 on page 28 respectively Please note that we assume that readers of this part have at least a basic knowledge of Visual Basic
6. 4 on page 23 In the corresponding Visual Basic projects ActivMeasure is used to inspect the pins of an IC Please consult the User s Manual for ActivMeasure for detailed information about this tool 3 1 Aligning the ROIs for ActivMeasure 2 22022000 16 3 2 Evaluating Results os s sea ee oa we ee ewe ee 18 33 QOutputof Results 6c eek ea we ee ee ee ee ewes 20 15 T E a D lt 2 lt 16 Combining ActivAlignment with other ActivVisionTools Visual Basic Example Aligning the ROls for ActivMeasure If alignment information is present in an Activ VisionTools application it is used automatically to align the regions of interest of other ActivVisionTools AVTAlignmentUse allows you to further configure the alignment behavior e g whether results are to be re aligned to the reference image or what is to happen if ActivAlignment fails to find the anchor In the example ActivMeasure is used to inspect the pins of an IC regarding their width and distance Preparation for the following example We recommend to open the project aligning alignment_aligning vbp as it already contains a suitable anchor furthermore the measuring parameters are already set up Execute the application Run gt Start or via the corresponding button and load the image sequence ic ic1 seq AVIViewFG can be opened by clicking into AVIView with the right mouse button and selecting Ima
7. AVTView1 ExecutionMode eApplicationMode Then Exit Sub End If ActivAlignment 2008 04 23
8. Default Default i Fit Cell Size I Substitute Default Unit Pixel check this box to show the used parameters specify default conditions Figure 3 2 Formulating conditions to evaluate the measurements ifying the same conditions for each object you can specify default conditions using AVTDecisionViewDefaults Defaults can be set per tool or per ROI ROI defaults override tool defaults and individual conditions override defaults If you check v Substitute Default the entries marked Default are substituted by their actual content To check the success of the alignment itself you can formulate a condition for ActivAlignment s feature Status e g that it must be equal to Success If you set the Angle Range to 60 the alignment fails for one image of the sequence ActivVisionTools 3 2 Your Fast Track to Solutions o g 2 2 lt 20 Combining ActivAlignment with other ActivVisionTools Visual Basic Example 3 3 Output of Results Using a Using ActivFile you can write the results and the evaluations to a log file How to access results via the programming interface is described in section 4 3 on page 28 how to output them via a serial interface or a digital I O board in the User s Manual for ActivSerial and the User s Manual for ActivDigitallO respectively Preparation for the following example If you worked on the pr
9. assign results to two groups to allow to display them using differ ent colors The contours of the alignment anchor ActivAlignment and the first edge of a pair ActivMeasure belong to group I Change the color of this group The search and the angle range ActivAlignment and the second edge of a pair Activ Measure belong to group II Change the color of this group ActivAlignment 2008 04 23 4 1 Adapting the Display of Results 25 O open AVTViewDisplayModes via a click on AVTView with the right mouse button Adapting the Display of ROIs lo x Search Parameters r yj Activ iewDisplayModes Active ROI Inactive Tools I Green r Display Region Wf Interest r Display Results Group Cyan id iB Error ROI Red ad Group II _ Magenta vha Selected Tool _ _ white 7 Error Red x x Load Anchor Angle Range 4 rls 70 Deg Search Region 4 gt 170 Pixels Minimum Visible 4 gt 70 Speedup 4 gt so Display Behavior IV Anchor Region IV Align ROIs I Angle Range IV Make Features Invariant JV Search Region JV Retur Alignment Features V Image Aligned Fail Feature Error Mode Set Reference Selected Yellow he le Display Mode Filled X Special D Magenta LUT E defaut J Text Background Contrasting Contours Pick Point Red 7 Line Widt
10. chapter you may continue using this project Otherwise open the project display alignment_display vbp and execute it Run gt Start or via the corresponding button Load the image sequence ic ic1 seq and create additional ROIs for ActivMeasure AVTViewFG and AVTViewROI can be opened at run time via a right mouse button click on AVTView The following steps are visualized in figure 4 1 not shown AVTMeasure Experiment by choosing different settings for the display parameters and watching the result Q OO Open AVTViewDisplayModes by clicking on AVTView with the right mouse button and selecting Display Modes in the popup menu Change the color of the selected pick point Select another pick point by clicking into its vicinity Change the color of the currently selected ROI Select another ROI by clicking into its vicinity Change the color of the other not selected ROIs of the currently selected tool Change the color of the ROIs of the other not selected tools Select another tool in the combo box ActivVisionTool of AVTViewROI if this box contains more than one item If you use ActivDecision to evaluate results it can mark ROIs evaluated as not okay in a special color Change the LUT look up table that is used to display the image Change the line width of the ROIs or of the results edges for ActivMeasure contours of the anchor and search and angle range for ActivAlignment The Activ VisionTools
11. modes your part is stored in the event queue and processed after the current cycle is finished If the cursor gets busy the ActivVisionTools have started a particularly time consuming operation e g connecting to an image acquisition device Any interaction on your part is then deferred to the end of this operation AVTViewStatus also shows the number of processed cycles and the time needed for the last processing cycle D AVTViewStatus display two types of messages Informative messages describe e g what the application is doing while it is busy while error messages indicate errors that prevent the application from working correctly e g the failure to detect the bar code type automatically Note that the failure to find an anchor ranks as an error only if you selected Stop Execution in the combo box Error Mode If AVTViewStatus is not added to an application error messages are displayed in popup dialogs More information about AVTViewStatus e g how to modify its appearance can be found in the User s Manual for Activ View section 3 3 on page 32 ActivVisionTools 3 2 Your Fast Track to Solutions o g 2 2 lt 28 Tips amp Tricks _ 4 3 Accessing Results Via the Programming Interface The previous chapters and sections showed how to use Activ VisionTools interactively i e via the graphical user interfaces presented by the underlying ActiveX controls
12. while keeping the left mouse button pressed Please experiment at this point with the different shapes The creation of a polygonal ROI lt is more complex By the first mouse movement the first side of the polygon is created You can add a new corner point by clicking on the line with the left mouse button when you drag it by keeping the mouse button pressed new polygon sides are created where you can again add new corner points To delete a corner point drag it onto a neighboring corner point You can now move the ROI by dragging its pick point in the middle By dragging the outer pick points you modify its shape Again please experiment to get familiar with the ROIs Note that for a polygonal ROI the middle point appears at the center of gravity of the ROI and therefore changes whenever the polygon is modified besides it ActivAlignment 2008 04 23 2 1 Selecting the Alignment Anchor 9 select AVTAlignment1 in the combo box 2 select a shape for the ROI w Creating Regions of Interest around the Alignment Anchor Edit Region of Interest i Copy Paste Delete r Select ActivVisionT ool AVTAlignment1 he Region of Interest Rectangle2_1 1 2 44 gt I Locked 3 draw the ROI in the image by pressing the left mouse button and moving the mouse you can copy paste and delete the selected ROI o
13. 4 gt res 1 120 8 ms Loading file board_01 esa re s __fo4 Display Behavior JV Anchor Region VV Align ROIs Dark gt Light zi Edge Type IV Angle Range Make Features Invariant Edge Pairs Edge Grouping IV Search Region J Return Alignment Features All Edges v Edge Selection Bice fianore gt Error Mode C fo ee Ene Load Anchor Set Reference f gt feo Noise Level tf gt 12 Rotwiath Standard v Accuracy l m ActivMeasure m AVTAlignmentUse Figure 1 3 The sub tools of ActivAlignment together with other tools in a measuring application The status of the alignment e g Success or Failure and after a successful alignment the movement of the anchor relative to the reference image can be sent to ActivDecision to evaluate them further and to output tools like ActivFile or ActivDigitallO furthermore you can access results via the programming interface see section 4 3 on page 28 1 2 The Sub Tools of ActivAlignment Besides its master tool ActivAlignment provides 2 support tools In figure 1 3 they are depicted in an example ActivVisionTools application where they are used to align a measuring ROI AVTAlignment is the master tool of ActivAlignment Note that this ActiveX control does not an E ActivVisionTools 3 2 Your Fast Track to Solutions o g 2 2 lt 6 About ActivAlignment have a graphical user interface
14. 5 on page 2 Imports ACTIVVTOOLSLib atToolResults contains the alignment results i e its Status e g Success or Failure and after a successful alignment the movement of the anchor relative to the reference image ActivVisionTools 3 2 Your Fast Track to Solutions o g 2 2 lt 30 Tips amp Tricks These results called features can be accessed by specifying their ID in a call to the method atToolResults Value feature handle The feature handles are available as functions of the corresponding tool e g AVTAlignment1 FeatureHandleStatus being the handle for the status of the alignment The values of the feature Status are adapted via Native Language Support see the manual Getting Started with Activ VisionTools to the different languages The used values are available via the programming interface The following code shows how to access the value signaling a successful alignment and compare the current alignment status to it Dim handleStatus As Integer Dim sStatusSuccess As String sStatusSuccess AVTAlignment1 NLS Text StatusSuccess handleStatus AVTAlignment1 FeatureHandleStatus If atToolResults Value handleStatus sStatusSuccess Then gt some reaction End If Note that in contrast to tools like ActivMeasure the results of ActivAlignment are available at tool level the ROIs themselves have no results 4 3 2 An Example Project The ActivVisionTools distribution includes
15. Teach and AVIViewStatus by double clicking a and Ai You may delete AVTViewROI as it can be opened at run time by clicking into AVTView with the right mouse button and selecting Region of Interest Otherwise open the project training alignment_training vbp Execute the application Run gt Start or via the corresponding button Open AVT ViewFG by clicking into AVIView with the right mouse button and selecting Im age Acquisition in the popup menu Select the image board board_01 in the combo box Input File The following steps are visualized in figure 2 2 You can specify a minimum contrast for contours with the slider Contrast or by directly typing the value in the text field to the right of the slider Alternatively click Auto to let ActivAlignment estimate the contrast value automatically The chosen value is valid for all ROIs of ActivAlignment If you know that the object will not appear in all possible orientations you may limit the corresponding range of rotation with the slider Angle Range or by directly typing the value in the text field to the right of the slider As mentioned in section 1 1 on page 2 you must restrict the range of rotation if the anchor shows any symmetries Note that you can also limit the range of rotation later in the application phase but you cannot use a larger range than the one you specified in the training phase The main disadvantage of teaching a large range
16. User s Manual AcTi ALIGNMENT Don t Bother About Location Microsoft Windows Windows NT Windows 2000 Windows XP Visual Basic Microsoft NET Visual C Visual C and ActiveX are either trademarks or registered trademarks of Microsoft Corporation All other nationally and internationally recognized trademarks and tradenames are hereby rec ognized or Copyright 2001 2008 by MVTec Software GmbH M nchen Germany mvrec settare cmon Edition 1 April 2001 ActivVisionTools 1 3 Edition 2 September 2001 ActivVisionTools 2 0 Edition 3 November 2002 ActivVisionTools 2 1 Edition 4 January 2005 ActivVisionTools 3 0 Edition 5 February 2006 ActivVisionTools 3 1 Edition 6 May 2008 ActivVisionTools 3 2 All rights reserved No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without prior written permission of the publisher More information about ActivVisionTools can be found at http www activ vision tools com How to Read This Manual This manual explains how to use ActivAlignment to automatically align regions of interest ROIs of other ActivVisionTools to moving parts It describes the functionality of Activ Alignment and its cooperation with other ActivVisionTools with Visual Basic examples Before reading this manual we recommend to read the manual Getting Started with ActivVisio
17. aligned ROI Row Center Column Center Row Center Column Center Row Center Column Center 110 353 373 000 94 076 407 494 109 561 373 251 132891 373 000 115 7934 413 722 132 155 373 251 155 942 373 000 137 989 420 085 155 255 373 251 178 710 373 000 159 885 426 365 178 023 373 251 201 558 373 000 181 818 432 654 200 839 373 251 224251 373 000 203 657 438 916 223589 373 251 246 982 373 000 225 504 445 181 246 286 373 251 269 889 373 000 247 512 451 451 269180 373 251 292 556 373 000 269 320 457 745 281 868 373 251 315 407 373 000 291488 464 015 3467 373 251 re aligned image reference aligned and back transformed measurements Figure 1 1 Aligning a measuring ROI to an IC ActivAlignment is used in two phases In the training phase you specify the alignment anchor this is typically done in the configuration mode In the application phase typically in the ap plication mode ActivAlignment automatically searches for the object in the current image and aligns the ROIs of other Activ VisionTools accordingly ActivAlignment 2008 04 23 1 1 Introducing ActivAlignment 3 The Reference Image To train ActivAlignment only one prototype image is required where the part you want to analyze via machine vision is in its default position In this so called reference image you select a region in the image that is to serve as the alignment anchor see below and create the ROIs that are to be aligned see figure 1a The po
18. atically In contrast if you try to access a non existant result via the programming interface a run time error is caused which halts your application To avoid this you can use the Visual Basic error handling mecha nisms i e set up an error handler that examines any occurring error and reacts in a suitable way In the example project if an error is caused by the result access a popup with the error descrip tion appears and the function SetAlarm is called To view the effect of the error handler switch of the creation of alignment features via the check box v Return Alignment Features in AVTAlignmentUse Z o E a D lt 2 lt ActivVisionTools 3 2 Your Fast Track to Solutions 34 Tips amp Tricks Private Sub AVTAlignment1_Finish atToolResults As _ ACTIVVTOOLSLib IAVTToolResult variable declarations On Error GoTo ErrorHandler procedure body Exit Sub ErrorHandler Dim sTitle As String If Left Err Source 11 ActivVTools Then sTitle ActivVisionTools Error Else sTitle Runtime Error amp CStr Err Number End If Call MsgBox Err Description vbExclamation sTitle Call SetAlarm End Sub By placing the following code at the beginning of AVTAlignment1_Finish the actual result access is restricted to the application mode With this mechanism you can setup the vision part of your application in the configuration mode without having to worry about run time errors If Not
19. bIsAligned which stores the status of the previous alignment to distinguish the following cases If the alignment fails for a new image bIsNewCycle True an error message is created If the alignment fails while you are try ing to find suitable parameters bIsNewCycle False and bIsAligned False nothing happens a message appears only when you have found a suitable parameter bIsNewCycle False and bIsAligned False Finally if you modify a parameter such that a previ ously successful alignment now fails bIsNewCycle False and bIsAligned True this is also signaled by a message ActivAlignment 2008 04 23 4 3 Accessing Results Via the Programming Interface 33 If atToolResults Value handleStatus sStatusSuccess Then If bIsAligned False And bIsNewCycle False Then sErrMsg Alignment error was repaired Call DisplayMessage sErrMsg Else bIsNewCycle False End If bIsAligned True If bIsError True Then Call ClearAlarm End If Else If bIsNewCycle True Then bIsNewCycle False sErrMsg Alignment failed Please change a parameter Call DisplayMessage sErrMsg Call SetAlarm Else If bIsAligned True Then sErrMsg Alignment error because of changed parameter Call DisplayMessage sErrMsg Call SetAlarm End If End If bIsAligned False End If When using the programming interface of ActivVisionTools you leave the safe world of the graphical user interfaces where all input is checked for validity autom
20. ctivMeasure oso a nussi 16 J JBVEIGGHINE Resums ocea aa et pe E oS Be ee a WC eR 18 3 3 Ou tp tof RESIS A a a ae oe 20 Tips amp Tricks 23 4 1 Adapting the Display of Results 2 2 2 000 24 4 2 Configuring the Two Execution Modes 26 4 3 Accessing Results Via the Programming Interface 28 Chapter 1 About ActivAlignment This chapter will introduce you to the features and the basic concepts of the change detector ActivAlignment It gives an overview about ActivAlignment s master tool and its support tools which are described in more detail in chapter 2 on page 7 and chapter 3 on page 15 1 1 Introducing ActivAlignment 1 2 The Sub Tools of ActivAlignment T E a D lt 2 lt 2 About ActivAlignment 1 1 Introducing ActivAlignment With the help of ActivAlignment you can align the regions of interest ROIs of other Activ VisionTools to moving parts In other words you can anchor an ROI to a certain object in the image if the object moves from image to image the ROI moves with it see figure 1 1 To anchor an ROI to an object you must first teach ActivAlignment how to recognize the object in an image For this you need one so called reference image in it you select a part that is to act as the alignment anchor i e by which the object can be recognized In figure 1 1 the imprint on the IC acts as the anchor b ROI not aligned c
21. e Range J Make Features Invariant IV Search Region VA ed J7 Image Aligned 7 m Load Anchor Set Reference Bal of Am D failures to find the anchor are reported in the status bar select what is to be displayed Figure 2 3 Finding the trained anchor in other images o g 2 2 lt if it is within the search space D To get to know the effect of the parameters described above step through the image sequence by clicking Single in AVTViewFG If ActivAlignment fails to find the anchor a corresponding error message appears in AVIViewStatus In the frame Display you can select what is to be displayed in AVTView The use of most check boxes is obvious if you check v Image Aligned the whole image including ROIs and results is transformed such that the anchor is positioned as it was in the reference image The parameters in the frame Behavior are described in section 3 1 on page 16 ActivVisionTools 3 2 Your Fast Track to Solutions 14 Using ActivAlignment ActivAlignment 2008 04 23 Chapter 3 Combining ActivAlignment with other ActivVisionTools While the previous chapter explained how to create an alignment anchor and to configure the search space this chapter shows how to actually align regions of interest of other Activ Vision Tools and how to evaluate and output their results How to access results via the programming interface is described in chapter
22. entation also the appearance of an object may change from image to image for example due to noise or partial occlusion Again it is advantageous to tell ActivAlignment how much the appearance may change in order to restrict the search Results If ActivAlignment finds the anchor in the current image ROIs of other ActivVisionTools are automatically aligned to it However what happens if ActivAlignment fails to find the anchor For this case you can choose between the following reactions First you can ignore the failure this means that the other tools will work on the ROIs as they were specified in the reference image and probably yield meaningless results Secondly you can choose to stop the application immediately i e before executing any other tools Finally ActivAlignment can create a so called error result In this case the application continues but the other tools do not perform any image processing on the ROIs that should have been aligned ActivAlignment 2008 04 23 1 2 The Sub Tools of ActivAlignment 5 ActivView Mind AVTAlignmentTeach ia The Sub Tools of ActivAlignment Do x El A Contr Auta 4 gt Jao Gray Angle Range 4 gt ji 80 Deg m Display JV Anchor Region IV Angle Range Apply Training Save Anchor IV Locked Search Parameters k Angle Range 4 r 120 Deg ja z Search Region 4 E 215 Pixels H ye Minimum Visible 4 H po Speed
23. evious example you may continue using this project At design time add AVTOutputFile by double clicking Otherwise open the project output alignment_output vbp Execute the application and load the image sequence ic ic1 seq The following steps are visualized in figure 3 3 only sub tools of ActivFile shown Q By clicking on Select you can open a file selector box to choose a file name for the log file which will then appear in the text field beside the button By pressing Clear File you can clear the content of the selected file By checking v Enable Writing you enable the writing mode You can open the ActivFile s two dialogs DialogFileOptions and DialogOutput DataSelect by clicking File Options and Data Selection respectively In DialogFileOptions you can choose between two file formats Standard text suffix txt and the so called comma separated values files suffix csv which can be used as an input to Microsoft Excel Furthermore you can select a delimiter In the same dialog you can limit the size of the log file in form of the number of cycles that are to be recorded A cycle corresponds to one processing cycle from image input to the evaluation and output of results If you use this option ActivFile creates two log files and switches between them thus assuring that you can always access at least the results o
24. f ActivView ActivAlignment lets you choose between different shapes of ROIs e g arbitrarily oriented rectangles or ellipses Preparation for the following example Open the project rois alignment_rois vbp Alternatively create a new project and place AVTView AVTViewROI and AVTAlignment on the form by double clicking the icons _ fea and en respectively with the left mouse button Note that AVTAlignment is only epresemad by its icon on the form Execute the application Run gt Start or via the corresponding button In this mode AVTAlignment is invisible Open AVTViewFG by clicking into AVTView with the right mouse button and selecting Image Acquisition in the popup menu Select the image board board_01 in the combo box Input File The following steps are visualized in figure 2 1 OO First you have to tell AVTViewROI to create an ROI for ActivAlignment by selecting the corresponding entry in the combo box ActivVisionTool In this box all Activ Vision Tools are listed that have been placed upon the form By default the tools are referenced by the name of the corresponding ActiveX control plus a counter to distinguish between multiple instances of a control on the form In our example there is only one item in the combo box AVTAlignment1 Next select the desired shape of the ROI for example an arbitrarily oriented rectangle To draw the ROI move the mouse in the image
25. f the last N cycles N being the specified number of cycles By pressing Estimate you can let ActivFile estimate the size of one cycle Note that you must first select the output data in order to get meaningful results In the left part of DialogOutputDataSelect you can navigate through the result hi erarchy similarly to ActivDecision In the other parts of DialogOutputDataSelect choose the output data by checking the corresponding boxes You may output different items depending on the evaluation of ActivAlignment 2008 04 23 3 3 Output of Results 21 select the name of the log file 4 select file format and delimiter gt check to enable writing limit the file to a number of cycles gt G click to open the dialogs estimate the file size for one cycle ia Writing Results to a Log File eparator T abulator z Clear File Dag Selection Limitations I F Limit File Size Maximum Ostes 5 Last estimated Data Size per Cycle f 56 KBytes Estimate v zox General Tool ROI Object IV Date and Time MV Name M Name V Name I Tags M okay M okay V okay Path JAVTMeasurel E AVTAlignment1 4 Tool ROI Object ame okay Yalue Min Max Interpretation Operation Circle_1 AVTMeasurel Objects Too L mj CL CT Li G AVTMeasurel Good ObjectAT ool 7 ae al Li mj CL H m Ee Line 1 Bad Objects T o
26. ge Acquisition The following steps are visualized in figure 3 1 D To create an ROI for ActivMeasure open AVTViewROI by clicking into AVTView with the right mouse button and selecting Region of Interest Select AVTMeasure1 in the combo box ActivVisionTool and create a line shaped ROI over the pins of the IC as shown in figure 3 1 Automatically the measured width of the pins the distance between them and the position of their centers is displayed in ActivData View Check v Align ROIs to let the ROI be aligned If you step through the image se quence by clicking Single in AVTViewFG the measuring ROI should now always lie over the pins If you check v Make Features Invariant the results of ActivMeasure are trans formed back into the reference image see section 1 1 on page 2 The effect can be seen clearly in the column Row Center In the reference image the pins are lined up horizontally therefore their respective Row Center varies only by one or two pixels If you switch to an image where the chip is rotated the values for Row Center will vary strongly before checking the box and correspond to the ones of the reference image afterwards For one image of the sequence ActivAlignment fails to find the anchor because of the limited angle range In the combo box Error Mode you can choose the desired reac tion If you select Ignore ROIs are not aligned i e the reference positio
27. h 3 Pixels z Line Width 2 Pixels s Text 7 MS Sans Serif 12pt m Display Image _ color of the selected pick point EE QeOeoO color of the different types of ROIs look up table for image display line width of the ROIs or of the edges and of the search and angle range 0000 color of the first edge of a pair and of the contours of the anchor color of the second edge of a pair and of the search and angle range color of objects that are not okay display mode for edges and contours Figure 4 1 Adapting the display of ROIs and results Change the color ActivDecision uses to mark objects evaluated as not okay O If you check this box the edges and contours are framed with a contrasting color to make them more visible against busy backgrounds ActivVisionTools 3 2 Your Fast Track to Solutions o g 2 2 lt 26 Tips amp Tricks Visual Basic Example 4 2 Configuring the Two Execution Modes Via and H In an ActivVisionTools application you can switch between two execution modes the config uration mode and the application mode The former should be used to setup and configure an application the latter to run it ActivView s support tools AVTViewExecute and AVTView ConfigExec allow you to switch between the two modes and to customize the behavior of an ActivVisionTools application in the two execution modes e g display live images
28. hor an ROI to a single character L as it appears twice in the second row The second implication of uniqueness is anchors should not show any rotational symmetry like for example the character S or N Otherwise they could be confused with themselves i e detected at the correct position but rotated by 180 Another solution for this problem is to restrict the range of orientation for which the anchor is trained to below 180 Similarly if you want to use a cross shaped anchor you must restrict the range of orientation to below 90 The request for stable anchors is already assured to a high degree by the shape based matching algorithm itself which is robust against changing illumination clutter and even partial occlu sion You can further enhance stability by selecting only significant contours i e contours with a high contrast see figure 1 2 on page 3 The Search Space The concept of a search space is closely related to the question how much the position of the anchor will differ from the reference image For example if the object to be inspected moves only slightly ActivAlignment can restrict its search for the anchor to a small part in the image This also holds for the possible orientation of an object The advantage of limiting the search space like this is of course a considerable speedup Moreover an anchor needs to be unique only within the search space But not only the position and ori
29. l _ C mj m C mj Good Object Good ROIs oo m E E m Hm Bad Objects Bad ROIs K K Vv C M C K T tine Objects ROI Vv ww PT wR EP wv O Good Objects ROI m m CO O O m E Bad Objects ROI M M M O M O M c Good Objects Width Vv Vv Vv C C E Li fo Distance Pair Vv M M C m O H mj Bad Objects Width M v WY Mv M C M q 4 ap Distance Pair v IX Y v V v ha gt V z lt T navigate through the results select the output data Figure 3 3 Customizing log files an object By clicking on the column labels with the right mouse button you can check or uncheck all boxes in the column similarly you can check or uncheck whole rows or all rows of a certain tool If you now step through the image sequence by clicking Single in AVTViewFG the log file is created Figure 3 4 shows part of an example log file including a failed alignment ActivVisionTools 3 2 Your Fast Track to Solutions 22 Combining ActivAlignment with other ActivVisionTools 09 23 04 14 38 56 AVTMeasurei no Bad ROIs Line_1 no Objects ROI Bad Objects ROI yes AVTAlignment1 yes 09 23 04 Status 14 38 57 AVTMeasurei no Bad ROIs Line_1 no Objects ROI Bad Objects ROI no yes Width yes 7 Distance Pair yes Width yes 7 Distance Pair yes Width yes 7 Distance Pair yes Width yes 7 Distance Pair 17 yes Width yes 7 Distance Pair 18 no Width yes 7 Distance Pair 19 yes Width yes 7 AVTAlignmen
30. ld meet the same condition Instead of spec ActivAlignment 2008 04 23 3 2 Evaluating Results O open the support tools via the context menu right mouse click first enable the update of results w Evaluating Results Using ActivDecisi 3 formulate conditions for objects ROIS or tools 4 the evaluations are displayed immediately 0 x lo x AVTAlignment LJ Tool RO Object Tool Features Obed b Number None Object 2 Bad Objects ROI Max Object 3 Object Width inside Object 4 Distance Pair Inside lt Nhiect A Object 1 Width Inside D ance Pai V Enable Update i Fit Cell Size JV Substitute Default Unit af Pizel AAO ETE E A TAlignment1 4 E AVTMeasurel AVTMeasurel E AVTMeasurel AVTMeasurel Objects Tool 1 100 Number None E Line_1 Bad Objects Tool Number None i Good ROls Number None ROI Features 4 ti a Bad ROls Number Max tine 1 Objects ROI Number Max T2601 RO Object ooo Nome_ _ Min Mas Inteeprotatonl Opexation Name Value Min Max Interpretation Operation Number None 15 x Objects ROI Number oper Line_1 Good Objects ROI a Han Number None 7 Bad Objects ROI 0 0 Number Max Width 7 000 8 500 Number Inside Distance Pair 5 200 8 700 Number Inside Line_1 Width Default Default Default Default 4 Distance Pair Default Default
31. n is used ActivAlignment 2008 04 23 3 1 Aligning the ROIs for ActivMeasure 17 O create an ROI for ActivMeasure specify whether it should be aligned ia Aligning the ROIs of ActivMeasure N alal I 5 x Search Parameters Angle Range 4 gt feo Deg Search Region 4 gt 170 Pixels Minimum Visible gt Speedup lt p ox Display JV Anchor Region I Angle Range IV Search Region z Behavior V Align ROls lt IV Make Features Invariant Return Alignment Features v Eror Mode Set Reference Ignore Load Anchor Dark gt Light Edge Type Edge Pairs v Edge Grouping ActivVisionTool AVTMeasurel he ROI vbo All Edges v Edge Selection Object Id Width Distance Pair Row Column Center 0 7 422 6 366 160 358 154 475 1 7 759 6 997 160 314 168 431 2 7 780 6 256 160 267 183 198 3 7 990 6 318 160 222 197 339 IV Enable Update Unit Pixel B check to transform results back 4 select the reaction to an alignment error into the reference image o g 2 2 lt check to make results available Figure 3 1 Aligning a measuring ROI to an IC In contrast in the mode Fail Feature ActivMeasure does not perform any image processing If you select Stop Execution the application stops before executing any othe
32. nTools which introduces the basic concepts of ActivVisionTools and the User s Manual for Activ View to learn how to load and display images To follow the examples actively first install and configure ActivVisionTools as described in the manual Getting Started with Activ VisionTools For each example in this manual there is a corresponding Visual Basic project these projects can be found in the subdirectory exam ples manuals activalignment of the ActivVisionTools base directory you specified during installation default C Program Files MVTec ActivVisionTools Of course you can also create your own Visual Basic projects from scratch We recommend to create a private copy of the example projects because by experimenting with the projects you also change their state which is then automatically stored in the so called description files extension dsc by ActivVisionTools Of course you can restore the state of a project by retrieving the corresponding description file from the CD _ Contents About ActivAlignment 1 1 1 Introducing AchyAlgament 64 he eA ee ee ee 2 1 2 The Sub Tools of ActivAlignment ss ee ea ee eee 5 Using ActivAlignment 7 2 1 Selecting the Alignment Anchor sse n cessare areentas 8 2 2 Teaching the Alignment Anchor gt op ea 6565555 Pade bee ie 10 2 3 Findine the Anchor Again o ces ceses dete iea ra ee 12 Combining ActivAlignment with other ActivVisionTools 15 3 1 Aligning the ROIs for A
33. of rotation is that the size of the internally stored training information grows proportionally with the range of rotation as a direct result of this not only the training itself takes more time but also the saving or loading of training data Furthermore if the training data gets too large to fit into virtual memory the application will be slowed down noticeably by the operating system In such a case you must limit the range of rotation in the training phase In the frame Display you can choose whether the anchor region and the angle range are displayed in AVTView By clicking Apply Training you start the training process which may take a while ActivAlignment 2008 04 23 2 2 Teaching the Alignment Anchor 11 O select the minimum contrast for contours select the allowed range of rotation G select what is to be displayed D train the anchor a corresponding message appears la xl Teaching the Alignment Anchor Teaching Parameters Contrast Auto 4 gt 80 Gray Angle Range 4 gt 180 Deg Display IV Anchor Region IV Angle Range Apply Training J Locked leaching Parameters Contrast Auto 4 PP 190 Gray Angle Range oo A 180 Deg ris 1 46 0 ms Loading file board 01 i Display IV Anchor Region IV Angle Range Ape Laining Save Anchor IV Locked
34. on 2 2 on page 10 With the slider Search Region you can restrict the search range i e the part of the image where the anchor is searched The search range is defined by expanding the anchor region s by the amount of pixels selected with the slider With the slider Minimum Visible you can specify how much of the anchor must be visible at least A part of the anchor may be invisible because it is occluded or outside the search range but also because of image disturbances e g noise The slider Speedup allows to trade safety for speed If you set it to 0 ActivAlignment applies a very thorough search algorithm that guarantees that the anchor is found if it is within the search space The higher the speedup factor the faster but also rougher the search will be with the possible effect that ActivAlignment fails to find an anchor even ActivAlignment 2008 04 23 2 3 Finding the Anchor Again 13 O load a training file use the current image as the reference 3 specify the range of rotation 4 specify the search range specify how much of the anchor select a speedup factor must be visble at least Finding the Alignment Anchor in Other Images Eo ol x r Search Par peters Angle Range 4 LAE so Deg Search Region 4 mh 115 Pixels Minimum Visible 4 La fzo Speedup 4 ao r Display IV Anchor Region IV Align ROIs iV Angl
35. only in the configuration mode to setup your application but then switch it off in the application mode to speed up the application A third sub tool AVTViewExecuteSimple provides a single button to execute the application In this section we also describe AVTViewStatus in more detail Preparation for the following example If you worked on the previous example you may continue using this project At design time add AVTViewExecuteSimple and AVTViewStatus to the form by double clicking the icons fj and Fj with the left mouse button Otherwise open the project usermodes alignment_usermodes vbp Execute the application and load the image sequence ic ic1 seq The following steps are visualized in figure 4 2 D Open AVTViewExecute and AVTViewConfigExec by clicking on AVTView with the right mouse button and selecting Execution and Execution Parameters Switch between the two execution modes via AVTViewExecute s combo box Mode To execute one cycle press Single With the other two buttons you can let the appli cation run continuously and stop it again By default AVTViewExecuteSimple starts and stops an application how to change its behavior to a single step button is described in the User s Manual for Activ View section 3 4 on page 34 D For each of the two execution modes you can choose what is to be displayed by checking the corresponding boxes in AVTViewConfigExec Fu
36. r delete all ROIs 4 edit the ROI by dragging the pick points step through the ROls of the selected tool with these buttons Q lock the selected ROI Figure 2 1 Creating regions of interest around the alignment anchor may even lie outside the ROI for concave polygons o g 2 2 lt To create a second ROL repeat step You can also copy paste and delete the selected ROI or delete all ROIs ROIs can be selected by clicking next to it in the image Alternatively use the two arrow buttons 4 to step through all the ROIs of the selected tool D By checking v Locked you can lock the selected ROI and thus prevent it from ac cidental editing Note that alignment ROIs are automatically locked after training the anchor see the following section If you create multiple ROIs for ActivAlignment they are internally fused to form one anchor region consisting of separate sub regions ActivVisionTools 3 2 Your Fast Track to Solutions 10 Using ActivAlignment Visual Basic Example 2 2 Teaching the Alignment Anchor Using ae After selecting one or more regions that are to serve as the anchor for alignment you actually teach the anchor using AVTAlignmentTeach Preparation for the following example If you worked on the previous example you may continue using this project At design time add AVTAlignment
37. r tools If you check v Return Alignment Features the results of ActivAlignment i e its status e g Success or Failure and after a successful alignment the movement of the anchor relative to the reference image is made available to tools like ActivDecision or ActivFile Note that the alignment results are automatically sent to other Activ Vision Tools whose ROIs are aligned i e without requiring any action on your part ActivVisionTools 3 2 Your Fast Track to Solutions 18 Combining ActivAlignment with other ActivVisionTools Visual Basic Example 3 2 Evaluating Results Using Et In the previous example you have employed ActivVisionTools to extract and display measure ment results Using ActivDecision you can now evaluate these results by formulating conditions the results have to meet in order to be okay For a detailed description of ActivDecision please consult the User s Manual for ActivDecision We continue with the example task of inspecting the pins of an IC To be accepted as okay the pins must be 7 0 8 5 pixels wide their distance should be 5 2 8 7 pixels Preparation for the following example If you worked on the previous example you may continue using this project At design time add AVTDecision to the form by double clicking zn with the left mouse button Otherwise open the project decisions alignment_decisions vbp Execute
38. restrict the search space see below and thereby speed up the 2 alignment process Z O oe Set lt E n Tea 1G im yes Pa Ne ve 3 T 1 Ee a a S a7 sc a ay eS Ta Bt lore le we y yz va Figure 1 2 The original image and the contours on the IC with a contrast higher than 34 41 48 gray levels In order to judge whether an image part forms a suitable anchor you need to know something about the underlying matching process In its current version ActivAlignment uses the so called shape based matching In contrast to the classical pattern matching techniques which are based on comparing pixel values directly shape based matching evaluates the shape of an object in ActivVisionTools 3 2 Your Fast Track to Solutions 4 About ActivAlignment form of its contours see figure 1 2 The main advantage is that contours characterize an object in a compressed way which significantly speeds up the matching process Furthermore the contours are robust against changing illumination conditions and are still recognizable in the presence of clutter noise or when the object is partially occluded Armed with this information let s take a closer look at some of the criteria for alignment anchors The requested uniqueness has two implications Obviously an anchor should appear only once in the image Applied to the example in figure 1 2 on page 3 this means that you should not anc
39. rthermore you can specify if images can be dragged to the image window and whether ROIs can be modified in the two modes by default this is disabled in the application mode to prevent you from accidentially moving or deleting an ROI In AVTViewStatus an icon indicates the current execution mode of the application In the mode Ma the application does not perform any processing and waits for your interaction If you start the continuous mode the cogwheels rotate any interaction on ActivAlignment 2008 04 23 4 2 Configuring the Two Execution Modes 27 O open the sub tools via the context menu of AVTView switch between the two modes D select what is to be displayed __ and whether ROIs can be edited G execute a single cycle or start stop the application w Customizing the Two User Modes Execution Application v Mode Execute Slaves Single Run Stop aExecution Parameters x Application Mode rd i IV Display Results Display ROIs IV Display Error Results I Allow ROI editing Allow Drag amp Drop E aes 4 N9 E E Configuration Mode IV Display Image IV Display Results K T ar IV Display ROIs IV Display Error Results 9 435 ms ae M Allow ROI editing V Allow Drag amp Drop current execution mode processing time or speed Q space for messages Figure 4 2 Customizing and switching between the two execution
40. sition of the anchor and the ROIs in the reference image is then stored when ActivAlignment finds the anchor in another image the stored information is used to align the ROIs ActivAlignment also offers to transform data of the current image back into the reference image For example you can transform the current image shown in figure 1 1c on page 2 to get the image shown in figure 1 1d on page 2 this kind of visualization helps to spot the differences between images more quickly Alternatively you can leave the visualization as it is and just transform the calculated results see figure 1 le on page 2 with the measured features being the centers of the edge pairs To see the effect of the transformation compare the values of Column Center in figure 1 le on page 2 This mechanism could also be called making the features invariant regarding position and orientation changes Selecting the Alignment Anchor In order to assure a robust alignment of ROIs you should exercise some care in selecting the part of the image that is to serve as the alignment anchor First of all the anchor must be visible at least partially for all possible positions and orientations of the part Secondly it should E be unique i e not to be confused with other parts of the image Thirdly the appearance of the anchor should not change from image to image i e it should be stable The better these fa criteria are met the more you can
41. t1 yes ActivAlignment 2008 04 23 Status no Max o 20 o o0 no Max Max Failure no Max yes 20 20 1 0 Max Max 268505 yes 7 230632 719226 yes 7 030830 818486 yes 6 217172 998314 yes 6 348477 879461 yes 6 929342 604921 7 000000 8 500000 Inside no 12 204086 5 200000 8 700000 Inside 614961 Success Figure 3 4 Part of an example log file Chapter 4 Tips amp Tricks This chapter contains additional information that facilitates working with ActivAlignment e g how to modify the graphical display of results and how to customize the appearance of an Activ Alignment application in the two execution modes Furthermore it shows how to access results directly via the programming interface of Activ VisionTools 4 1 Adapting the Display of Results 02 2220 222 24 4 2 Configuring the Two Execution Modes 02 e00 26 4 3 Accessing Results Via the Programming Interface 28 3 Basie Principles ri oe eae ee ORAS SE Eee we EA 29 4 3 2 An Example Project 23 Z E a D lt 2 lt 24 Tips amp Tricks Visual Basic Example 4 1 Adapting the Display of Results Using al You can adapt the way results and ROIs are displayed using AVTViewDisplayModes which is a support tool of Activ View Preparation for the following example If you worked on the example in the previous
42. the application and load the image sequence ic ic1 seq The following steps are visualized in figure 3 2 only AVTDecision shown The main functionality of ActivDecision is presented by its support tools which can be opened via clicking on AVTDecision with the right mouse button The master tool displays the overall evaluation of the application To view the current feature and evaluation results check v Enable Update in AVT DecisionViewResults ActivDecision lets you compare the value of an individual object ROI or tool feature with two boundary values a minimum and a maximum value You can formulate con ditions for features by specifying values in the columns Min and Max and selecting a comparison mode in the column Operation If you select None the feature is not eval uated Figure 3 2 shows suitable conditions to check that all 20 pins are present and okay Those features that meet their condition appear in green the others in red If at least one feature is not okay the whole object ROI or tool is evaluated as not okay as well Analogously the overall evaluation of application which is visualized by AVT Decision depends on the tool evaluations Step through the image sequence by click ing Single in AVTViewFG and examine the evaluations In some of the images pins are bent resulting in a wrong width or distance In the example application all pins shou
43. the example Visual Basic project resultaccess alignment_resultaccess vbp which uses the methods described in the previous section to extend the application of chapter 3 on page 15 The example project has been configured in such a way that the alignment fails for one image of the image sequence ic ici seq This is checked and signaled by an error message By increasing the parameter Angle Range in AVTAlignmentUse you can repair the alignment which is also signaled by the application Besides accessing the alignment status the project code contains additional functionality which is explained briefly in the following only for Visual Basic 6 0 Ifthe alignment fails the func tion SetAlarm stops the application and switches the color of the element beside the message list to red The function ClearAlarm resets the color to green ActivAlignment 2008 04 23 4 3 Accessing Results Via the Programming Interface 31 Accessing the Results via the Programming Interface oj x r Search Parameters Angle Range af gt B9 Deg Search Region att gt gt 170 Pixels Minimum Visible 4f gt o z EEE EELS L ip aceeteengeasane fees Speedup 4 30 Display Behavior JV Anchor Region IV Align ROIs I Angle Range IV Make Features Invariant IV Search Region JV Return Alignment Features I Image Aligned Fail Feature Error Mode Load Anchor Anchor Set Reference Dark gt Light Edge Type
44. thus it is represented by its icon at design time and invisible at run time If you forget to add it to the form and only add the support tools they are disabled M AVTAlignmentTeach is a support tool of ActivAlignment It allows you to teach the patterns MEF to which the ROIs of other ActivVisionTools are to be aligned to How to use AVTAlignment Teach is described in section 2 2 on page 10 M AVTAlignmentUse is a support tool of ActivAlignment It allows to specify the search space H for the pattern and to select what is to be aligned and displayed How to use AVTAlignmentUse is described in section 2 3 on page 12 and section 3 1 on page 16 ActivAlignment 2008 04 23 Chapter 2 Using ActivAlignment This chapter will explain how to specify an alignment anchor and restrict the search space The actual alignment of ROIs of other Activ VisionTools is the topic of the next chapter The corresponding Visual Basic projects show how to successfully recognize an IC in a sequence of images 2 1 Selecting the Alignment Anchor 22 2200 2000s 8 2 2 Teaching the Alignment Anchor 0222200 ee ee 10 2 3 Finding the Anchor Again e sese 2 2 2 2 eee eee eee eens 12 Z E a D lt 2 lt Using ActivAlignment Visual Basic Example 2 1 Selecting the Alignment Anchor Using 4 You select an alignment anchor by creating regions of interest around it using AVTViewROI which is a support tool o
45. wn in figure 4 3 In the header of the code window corresponding to a form there are two combo boxes Select the instance of AVTAlignment by default called AVTAlignment1 in the left combo box The right combo box then lists all events available for this object when you select Finish the event procedure is created automatically PA Project1 Form1 Code 5 xj AVTAlignmentt gt Finish X Private Sub AVTAlignmenti Finish atToolResults As ACTIVVTOOLSLib IAVTToolResult Figure 4 3 Creating a procedure to handle the event Finish In Visual Basic NET the event handler has a different signature Private Sub AxAVTAlignmenti_Finish ByVal sender As Object _ ByVal e As _ AxActivVTools __AVTAlignment_FinishEvent E Handles AxAVTAlignment1 Finish A first difference is that tool names start the prefix Ax i e AVTAlignment becomes AxAVT Alignment The main difference however is that the tool results are not directly passed in stead they are encapsulated in the parameter e From there they can be extracted with the following lines Dim atToolResults As AVTToolResult atToolResults e atToolResults To use classes like ACTIVVTOOLSLib AVTToolResult without the namespace ACTIVVTOOL SLib as in the code above you must import this namespace by inserting the following line at the very beginning of the code more information about importing namespaces can be found in the Advanced User s Guide for ActivVisionTools in section 1 2 4
Download Pdf Manuals
Related Search