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if you can make a mask-image of that "special roi", it's all easy. a lot og opencv image ops take binary masks (to reduce the procssed pixels), you can even use them directly: i.e Mat mask_out = gray_image & mask would leave only the pixels from gray, where mask was non-null

if you can make a mask-image of that "special roi", it's all easy. a lot og easy.

many opencv image ops take binary masks (to reduce the procssed pixels), pixels),

you can even use them directly: directly:

i.e Mat mask_out = gray_image & mask would leave only the pixels from gray, where mask was non-null

if you can make a mask-image of that "special roi", it's all easy.

many opencv image ops take binary masks (to reduce the procssed processed pixels),

you can even use them directly:directly, i.e :

Mat mask_out = gray_image & maskmask