How would I detect gray/white pixels in a picture?

Question

Ali Almakhmari 2022-8-8

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回答： Walter Roberson 2022-8-9

I am trying to write a function to detect white-like and gray-like pixels in a given colored picture. I am stuck on how to go about it. Any help is appreciated.

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yanqi liu 2022-8-9

yes，sir，may be upload your image file to analysis

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Answer 1

Walter Roberson 2022-8-9

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Convert for HSV, check for "high" V (near 1) and "small" (near 0) S. You will need to decide on the exact boundaries, depending how "white like" or "gray like" you want to allow.

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Answer 2

KSSV 2022-8-8

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在 MATLAB Online 中打开

REad about find. Gve the pixle value as zero and use find. This will give you the indices.

[y,x] = find(I==0) ; % I is gray image

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Ali Almakhmari 2022-8-8

But that would require me to manually identifiy the gray pixels and assign them to zero. Which is the thing I am trying to automate with this function.

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