How to not consider the image background in binarization of a circular image?

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Pouria Nakhaei 2020-11-2

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https://ww2.mathworks.cn/matlabcentral/answers/634004-how-to-not-consider-the-image-background-in-binarization-of-a-circular-image

回答： Parth Dethaliya 2020-11-12

Hi all,

I have a circular CT scan image of a concrete sample. I want to only consider the image in the binarization process and either omit the background or somehow do not consider it in the binary image. I have used many codes, but still, the background pixels count in the binary image. I would really appreciate your help.

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Answer 1

Parth Dethaliya 2020-11-12

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https://ww2.mathworks.cn/matlabcentral/answers/634004-how-to-not-consider-the-image-background-in-binarization-of-a-circular-image#answer_541933

You can try this:

Binarize whole image such that the Region of Interest (the central part) is white (1's) and fill holes.
So you will have a mask for the ROI, Now just crop the binarized image (without holes filled) using the mask

I hope you may get the desired output, even these steps can be automized or performed in general if you have long dataset.