How do I find the radius and count of the black circles (blobs) in the image.

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The tricky part is that imfindcircles gets confused between the inner white circle and the boundary. How do I use edge detect on just the black circle ? I would like to completely transform this image into pure black and white image so that I can use imfindcircles to get the answers. Any advise is appreciated.

Accepted Answer

Image Analyst
Image Analyst on 17 Mar 2020
Just get rid of them:
% Invert mask so black is white.
mask = ~mask;
% Fill holes
mask = imfill(mask, 'holes');
No need to invert again and turn your object black since MATLAB only considers the white blobs when doing operations.

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