How to set pixel values in 100*100 matrix?

Question

znnz 2020-10-25

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/625418-how-to-set-pixel-values-in-100-100-matrix

回答： Ameer Hamza 2020-10-25

I should set 1/3 pixels have value 50, 1/3 pixels have value 100, and remaining 1/3 pixels have value 200. How to set pixels 50, 100, 200 in 100*100 matrix?

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Answer 1

Ameer Hamza 2020-10-25

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/625418-how-to-set-pixel-values-in-100-100-matrix#answer_523878

在 MATLAB Online 中打开

Try something like this

img = zeros(100, 'uint8');
idx_all = 1:numel(img);
idxs = cell(1,3);
for i = 1:numel(idxs)-1
    idx_temp = randperm(numel(idx_all), round(numel(img)/3));
    idxs{i} = idx_all(idx_temp);
    idx_all(idx_temp) = [];
end
idxs{end} = idx_all;
img(idxs{1}) = 50;
img(idxs{2}) = 100;
img(idxs{3}) = 200;