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I don't know if I get you right. So, you want to know why you should use Watersheds since you need to place some markers. So watershed is a segmentation algorithm (like graphcut) which needs some supervision, e.g. what is foreground and what is background, then it trys to segment both parts. And yes, you need to find those markers in a different way. Thus, it depends on your application if you need it or not.