[Insight-users] Exact boundary obtained by the approximate boundary

[superzz]

Hello
I have an approximate round object in picture. I can use hough circle to
determine the circle object center and radius. The hough circle result is
its approximate boundary. I want to use hough circle result as inital
result, and use some algorithm to obtain the exact boundary. What algorithm
I should use? 

Thanks

superZZ
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