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Really depends what you are trying to improve, do you find you have too many contours and want to cut down or not enough, or a combination? How has the image been filtered to get the contours? There could be many reasons why its not performing; the idea is to find the variation that is coursing the issue, then use merging to improve. Could be as simple as iterating through all the contours and keep the ones that appear on all 3 images. I hope this gives you some insight on potentially where to start.
