Geometric Matching FAQs

Q: Reposition Region of Interest and Reference Coordinate System are dimmed. How can I make these options available?

Insert a Set Coordinate System step before this step to make the Reposition Region of Interest and Reference Coordinate System controls available.

Q: What does the red dot in the template image indicate?

The red dot indicates the coordinate location on the template that is returned when the step finds template matches in the inspection image. The offset between the center of the template and the match location returned can be specified in the NI Vision Template Editor.

Q: What is the difference between the green and red regions?

The green region indicates the area of the image in which you want to search for matches to the template. The red region indicates an area that matches the template.

Q: Additional edges are detected in the image, besides the curves of my template. Does this affect the accuracy of the matching?

Extra edge detection can negatively affect the accuracy of geometric matching. Adjust the curve parameters so that the algorithm detects only the curves of your template object. For example, if the algorithm detects additional edges because of glare, use the Geometric Matching Training Interface to define regions with edges you want the function to ignore.