[Insight-users] how to extract the contour in a binary image

[Quan]

hello everyone:
i get a binary image ,the pixels==1 reprensent the foreground and pixels==0 represent background.Now i want to get the contour of the different regions.and i dont wanna use edge detectors like "LOG" or "Sobel".can anybody give me some advice?in addition,it seems that itk::ExtractImageFilter cannot do this task.
thanks
Quan
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