- run EDGE on the binary image. You now have a binary image with the edges.
- create a binary image with your circle being the TRUEs. Depending on how you specified your circle, this should be a very reasonable task.
- AND these two binaries together. You should find the points of intersection. You might need to clean them up a bit is all.
point of intersection of a circle and binary image
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Doug Hull on 18 Nov 2014
I have an ugly solution that might be what you want: