Create Region of Interest FAQs

NI Vision Builder

Process Images Tab

Create Region of Interest FAQs

Q: Why is my region of interest not drawn in the image when I insert the step in the inspection?

The Create Region of Interest step does not overlay the region of interest onto the image because the step where the region of interest is used will overlay the region of interest.

You can modify this default behavior by modifying the step overlay. Click the  Setup Overlay button and enable the overlay of the region of interest for the Create Region of Interest step.

Q: Why is the region of interest I created not repositioned correctly in subsequent steps?

If one or more coordinates of the region of interest are based on measurements from previous steps or variable values, the value of the measurement or variable is likely to change each time it is computed. If this is the case, there is no need to reposition the ROI again in the step where the ROI is used. It is not recommended to use both Reposition Region of Interest and previous measurements to define an ROI.