National Instruments IMAQTM 用户手册
Chapter 5
Performing Machine Vision Tasks
5-4
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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.
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
1
4
1
4
a.
b.
2
3
3
2