How do I remove islands in a non-binary greyscale image?

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Cyrus N 2017-6-27

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编辑： Cyrus N 2017-6-28

I understand that bwareaopen() serves as a similar function however using the command yields a binary image when I need to retain the original intensity range.

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Answer 1

Cyrus N 2017-6-27

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https://ww2.mathworks.cn/matlabcentral/answers/346507-how-do-i-remove-islands-in-a-non-binary-greyscale-image#answer_272152

编辑：Cyrus N 2017-6-28

the trick is to use the bwareaopen() which actually removes the islands then use the binary image to cut out the original islands using OrigionalImageName(~BinaryImageName) = 0;. This uses the island free binary image to cut the islands out of the greyscale original image.

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Image Analyst 2017-6-27

I've never heard of "bwarefunction()" - it's not built into the Image Processing Toolbox.

To remove "islands" I'd first get the binary image of the islands somehow, for example by thresholding, then I'd call regionfill() to smear the surrounding values in to replace the islands with gray levels.

Also, we don't know if your islands are brighter or darker than the surround because you forgot to attach an image.

I'm not sure of your definition of removing islands, but it looks like it replaces them with zeros. Not sure why that is called a removal.

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