Hi. Anyone has an idea how to find the area at red region area?

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Accepted Answer

Image Analyst
Image Analyst on 6 Jan 2022
% Take the 3 largest blobs
mask = bwareafilt(mask, 3);
% Assume we want the middle one. Label the blobs 1, 2, and 3.
[labeledImage, numBlobs] = bwlabel(mask);
% Extract the middle one, which has label 2:
middleBlob = ismember(labeledImage, 2);
imshow(middleBlob); % Display it.
Image Analyst
Image Analyst on 6 Jan 2022
Thanks for adding that @DGM - I forgot that.
There is also a function bwarea() you can use. It weights the area according to the shape of the boundary locally so it gives a different area than summing the pixels or using nnz(). I don't usually use bwarea() though. I use nnz(). I've been told it's slightly faster than using sum().
Thanks for accepting the answer @Iszuzuldin amirull bin mohd janudin 🙂

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