Obtaining the largest object in an image

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med-sweng 2014-11-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/164658-obtaining-the-largest-object-in-an-image

评论： Image Analyst 2014-12-1

采纳的回答： Image Analyst

Say that I have an image with a big object, and then small objects spread apart.

How can I retrieve only that big object?

I think we can use "bwconncomp"?

But, how exactly can we do that here?

Thanks.

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Answer 1

Image Analyst 2014-11-28

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/164658-obtaining-the-largest-object-in-an-image#answer_160550

ExtractBiggestBlob.m

I thought I've given this to you before. Oh well, maybe it was someone else. I've posted it lots and lots of times. Here it is again. The function inside the attached demo will let you extract the N largest or smallest blobs in a binary image.

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med-sweng 2014-12-1

编辑：med-sweng 2014-12-1

Thanks for the nice answer. For the final result, if I want to imwrite it, would it be doing the following?

imwrite(binaryImage, 'FinalResult.png');

after:

binaryImage = biggestBlob > 0;

Image Analyst 2014-12-1

在 MATLAB Online 中打开

Yes. But you might want to multiply it by 255 first so you can see it without scaling, like if you want a nice thumbnail image in your operating system

imwrite(uint8(255*binaryImage), filename);

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