How to crop the internal area of a contour?

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I am working on Retinal fundus images.The image consists of a circular retina on a black background. With OpenCV, I have managed to get a contour which surrounds the whole circular Retina. What I need is to crop out the circular retina from the black background.

asked 49 secs ago

user3305282

6

How to crop the internal area of a contour?