Coloring the largest component with different color than others

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Sultan 2017-7-12

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https://ww2.mathworks.cn/matlabcentral/answers/348456-coloring-the-largest-component-with-different-color-than-others

回答： Prashant Arora 2017-7-17

Hello all,

I am looking to mark the largest connected component in an image with special color say 'red', and then color the other components in black while the empty space I wanted to be colored in white.Here are my codes.

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Sultan 2017-7-12

在 MATLAB Online 中打开

   A=rand(100);
     B=A<.5
     CC = bwconncomp(B,4)
   numOfPixels = cellfun(@numel,CC.PixelIdxList)
   [unused,indexOfMax] = max(numOfPixels)
   biggest = zeros(size(B))
   biggest(CC.PixelIdxList{indexOfMax}) = 1
        colours=[1 1 1;1 0 0;0 0 0]
colormap (colours)
     imagesc(biggest)

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Answer 1

Prashant Arora 2017-7-17

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/348456-coloring-the-largest-component-with-different-color-than-others#answer_274480

在 MATLAB Online 中打开

Hi Sultan,

You can use the method below to achieve your use-case.

image = zeros(size(biggest,1),size(biggest,2),3);
NotBiggest = B - biggest;
image(:,:,1) = biggest + 1*NotBiggest;
image(:,:,2) = 0*biggest + 1*NotBiggest;
image(:,:,3) = 0*biggest + 1*NotBiggest;
imagesc(image);