Techniques which can be used for delineating the rim of a feature?

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Hein Van Gils

edge enhancement (ERDAS, Python and matlab)

Farzana Shaheen

I have tried Sobel edge detection, it worked well. Thank you Hein

Louis Andreani

You also have tools to extract circular features like Hough Circle transform.

You can implement a workflow as follow:

1. compute absolute gradient

2. use a ridge detection filter (e.g. hessian) to get linear feature

3. apply a threshold

4. use hough circle transform