National Instruments IMAQTM - Manual (Page 56)

Chapter 5 Performing Machine Vision Tasks
IMAQ Vision for Visual Basic User Manual 5-4 ni.com
Figure 5-2. Coordinate Systems of a Reference Image and Inspection Image
b. If you use
CWMachineVision.FindCoordTransformUsingTwoRects ,
specify two rectangular ROIs, each containing one separate,
straight boundary of the object, as shown in Figure 5-3. The
boundaries cannot be parallel. The regions must be large enough
to include the boundaries in all of the images you want to inspect.
1 Search Area for the Coordinate System
2 Object Edges
3 Origin of the Coordinate System
4 Measurement Area
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4
1
4
a. b.
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3
3
2