point of intersection of a circle and binary image

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Yeshudas Muttu
Yeshudas Muttu 2014-11-18
回答： Doug Hull 2014-11-18
i have a binary image and i have plot a circle on it as shown in figure A.The circle intersects the image at 4 points.But i want to mark two point with cross marker similar to figure B .How do i do that. Plz help

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Doug Hull
Doug Hull 2014-11-18
I have an ugly solution that might be what you want:
  • 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.

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