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

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Iszuzuldin amirull bin mohd janudin 2022-1-6

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https://ww2.mathworks.cn/matlabcentral/answers/1623235-hi-anyone-has-an-idea-how-to-find-the-area-at-red-region-area

评论： Image Analyst 2022-1-6

采纳的回答： Image Analyst

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KSSV 2022-1-6

Attach the original image.

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Image Analyst 2022-1-6

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https://ww2.mathworks.cn/matlabcentral/answers/1623235-hi-anyone-has-an-idea-how-to-find-the-area-at-red-region-area#answer_869060

在 MATLAB Online 中打开

%  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.

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Iszuzuldin amirull bin mohd janudin 2022-1-6

在 MATLAB Online 中打开

Thabk youu did it

Image Analyst 2022-1-6

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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