For finding the contour of the image

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Neil Liu
Neil Liu 2015-3-20
Hello everybody! Wish you all a good day! I have use "meanshift" to get some images.Just like:
And
Or
here we can see clearly we have a similar circle in the image. Could you please tell me how to keep or just identify it (like the following 3 images without the lighter parts!):
We can see that these images always have some connected edge with the meaningless parts, which causes the problem.

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