How to apply the outlines defined by superpixels to a hyperspectral image to calculate the mean spectrum of each superpixel?

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Laura 2023-3-19

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https://ww2.mathworks.cn/matlabcentral/answers/1931530-how-to-apply-the-outlines-defined-by-superpixels-to-a-hyperspectral-image-to-calculate-the-mean-spec

评论： Laura 2023-3-21

I have applied the function superpixels to extract the outlines of several pixels wich have similar colour within an RGB image. Now I want to apply these outlines to the original hypercube to obtain the mean spectrum for each of these superpixels. Can you help me?

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Answer 1

Parth Parikh 2023-3-21

在 MATLAB Online 中打开

Hi Laura,

Here is the code you can try:

Suppose you have number of labels (N) and label matrix (L) from superpixels function.

[rows, cols, channels] = size(hypercube);
hypercube = reshape(hypercube, [rows*cols channels]);
idx = label2idx(L); 
outputImg = zeros(rows*cols, channels);
for labelVal = 1:N
    idxs = idx{labelVal};
    outputImg(idxs, :) = repmat(mean(hypercube(idxs,:)), length(idxs),1);
end
outputImg = reshape(outputImg, [rows, cols, channels]);