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Hi

I'm trying to recognize a circle (concentric ring with 12 color segments - identified by black as the starting segment). I need to find the colors in the 12 segments(only black would be fixed, others could be any color). When I try to use the contour approach, it doesnt seem to find the black segment. It is able to draw contours for the other colors but not black.

Since the color purity depends on the camera, lighting etc, I'm getting lot of false positives. What filters can we applied.

I would appreciate if you can provide any pointers.

Thanks in advance.