My experience is with industrial vision systems - Cognex Omron, and similar.
I am looking for width measurement functions similar to what they do... so far, I cannot find them. Am I searching for the wrong terms, or is this a function not commonly used outside of industrial measurement systems?
Full description of what I want: Get full image - assume a single bright object on a black background. Define a ROI (rectangle) Normalize it if not already aligned with the axis of interest. Also compress it to 1D Run a gradient filter on it Look for a minimum and maximum and compute the distance in pixels between the 2 edges