Get inidces for specific conditions from binary mask
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Dear MATLAB-Community,
I have a binary mask M (attached).
I would like to get the indices that match the following condition: Find all "1" that have at least one "0" as a neighboring entry.
I have tried a lot the last days but did not find a solution. It would be great if someone could help me with that.
Best regards!
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Accepted Answer
Walter Roberson
on 31 Oct 2021
NC = conv2(M, [1 1 1; 1 0 1; 1 1 1], 'same');
mask = M & (NC < 8);
%now you can find() on mask
More Answers (1)
Image Analyst
on 31 Oct 2021
There is a built-in function for this in the Image Processing Toolbox. It's called bwperim(). Full demo:
s = load('m.mat')
M = s.M;
subplot(2, 1, 1);
imshow(M, [])
axis('on', 'image')
% Find all 1 that have a zero as a neighbor.
% We can use bwperim() for this
perimImage = bwperim(M);
subplot(2, 1, 2);
imshow(perimImage, [])
axis('on', 'image')
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/785188/image.png)
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