Edge detection when the boundaries are clearly marked

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Kasthuri Kannan 2019-11-6

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https://ww2.mathworks.cn/matlabcentral/answers/489426-edge-detection-when-the-boundaries-are-clearly-marked

评论： Kasthuri Kannan 2019-11-6

I have an image like this and I need to extract the regions marked by the boundaries highlighted by the color. How do I do it? This may be a simple question, but I realize no question is simple in image processing. Thanks.

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darova 2019-11-6

You want those boundaries to be separate?

Kasthuri Kannan 2019-11-6

Yes, like the black boundary is one region, green another etc. In general, there could be as many as 9 such boundaries and I want to mark them separately. Thanks.

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Answer 1

darova 2019-11-6

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https://ww2.mathworks.cn/matlabcentral/answers/489426-edge-detection-when-the-boundaries-are-clearly-marked#answer_400156

在 MATLAB Online 中打开

Try this:

A = imread('test.jpeg');
subplot(1,2,1)
imshow(A)
RGB = [140 224 226];      % color you want (cyan)
% RGB = [226 129 226];      % color you want (magenta)
% RGB = [150 240 120];      % color you want (green)
% RGB = [120 120 120];      % color you want (grey)
% RGB = [120 120 190];      % color you want (violet)
% RGB = [230 170 140];      % color you want (orange)
e = 20;                   % color shift		
c1 = abs(RGB(1)-double(A(:,:,1))) < e;
c2 = abs(RGB(2)-double(A(:,:,2))) < e;
c3 = abs(RGB(3)-double(A(:,:,2))) < e;
B = (c1+c2+c3)==3;
B1 = bwareaopen(B,10);      % remove small areas
I = repmat(B1,[1 1 3]);
I = uint8(I).*A;
subplot(1,2,2)
imshow(I)