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How to detect and label edges of a binary image?

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Trevor
Trevor 2020-9-4
评论： Mohammad Abu-Haifa 2020-10-16
I am trying to get the pixel positions of the outer edge and the inner edge of the image separately.
I am trying to do so by using the edge function (with sobel method) which gives good results. Here are the problems I am facing:
  1. I want the outer most edge and the inner edge. All the other noises/separated islands in the images are something I would like to filter out. Is there any way to run the edge detection/any other function to do that?
  2. I want to get the pixel positions of the outermost edge and the inner most edge separately. Is there anyway to label the continuous edges so that I can store them separately?
I am open to suggestion about any other way to achieve the above mentioned goals. Thank you.

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Trevor
Trevor 2020-9-4
Well, I felt like I should post the solution in case someone needs it in future.
I filtered out the islands/discontinuous edges by using bwareaopen() .
I detected the edge using edge() function
Then I used bwconncomp() function followed by labelmatrix() to label the edges.

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