Color moments by MATLAB code

Question

Dhurgham Al-karawi 2015-10-26

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https://ww2.mathworks.cn/matlabcentral/answers/251120-color-moments-by-matlab-code

编辑： Image Analyst 2023-11-6

I am seeking help. I would like to measure in MATLAB one feature extraction type, which is "color moments", but unfortunately, I could not find it. Can I get this code? Many thanks.

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Answer 1

Shrikanth 2015-11-13

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https://ww2.mathworks.cn/matlabcentral/answers/251120-color-moments-by-matlab-code#answer_199651

编辑：Image Analyst 2015-11-13

在 MATLAB Online 中打开

% Extract RGB Channel
R=I(:,:,1);
G=I(:,:,2);
B=I(:,:,3);
% Extract Statistical features
% 1] MEAN
meanR=mean2(R);
meanG=mean2(G);
meanB=mean2(B);
% 2] Standard Deviation
stdR=std2(R);
stdG=std2(G);
stdB=std2(B);
A=[meanR meanG meanB stdR stdG stdB];

I think this will help you to find color moments in a color image.

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Walter Roberson 2023-11-6

在 MATLAB Online 中打开

skews = squeeze(skewness(I, 1, [1 2]));

then skews(1) for R, skews(2) for G, skews(3) for B

Image Analyst 2023-11-6

编辑：Image Analyst 2023-11-6

moments_spatial_central.m

Note that these statistics are based purely on the pixel intensity alone. They are not spatial moments (like moment of inertia) that depends on where the pixels are located. If you want spatial moments, see my attached demo on spatial moments.

So mean, std, and skewness would give you the same answer if all the pixels were in an intensity ramp, or if they were distributed in a donut shape, or any other shape. The spatial moments would give you different values for those two images. I just want to make sure you know what you're measuring, and what is possible, so you can make the right choice for your situation.

Fun web site: https://labs.tineye.com/multicolr/

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