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So you need only outer contour use CV_RETR_EXTERNAL instead CV_RETR_CCOMP which retrieves only the extreme outer contours. Also see the answer here might be helpful.

So you need only outer contour contour, then instead of CV_RETR_CCOMP use CV_RETR_EXTERNAL instead CV_RETR_CCOMP which retrieves only the extreme outer contours. Also see the answer here might be helpful.