separate the red part of imge

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PK 2016-10-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/306067-separate-the-red-part-of-imge

评论： Image Analyst 2016-10-6

采纳的回答： Matthew Eicholtz

I have an red flower image with green leaf. I want to separate only red flower. How can I do? Please help!

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Answer 1

Matthew Eicholtz 2016-10-6

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https://ww2.mathworks.cn/matlabcentral/answers/306067-separate-the-red-part-of-imge#answer_237765

编辑：Matthew Eicholtz 2016-10-6

在 MATLAB Online 中打开

A naive approach would be to extract "red" colors from the image:

I = imread('peppers.png');
R = I(:,:,1);
G = I(:,:,2);
B = I(:,:,3);
% Here I am naively defining "red" as the red layer being greater than
% some threshold and the blue and green layers being less than that threshold
thold = 100;
mask = R>thold & G<thold & B<thold;
R(~mask) = 255;
G(~mask) = 255;
B(~mask) = 255;
J = cat(3,R,G,B);
figure; montage(cat(4,I,J),'Size',[1 2]);

More advanced approaches exists (google "image segmentation"). For instance, see the MATLAB example for color-based segmentation using k-means clustering.