Creating a mat file with binary mask

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Gulfam Saju 2022-4-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1701845-creating-a-mat-file-with-binary-mask

评论： Gulfam Saju 2022-5-9

I want to create a 256*256 mask.mat file, where the middle 32 lines will be white (binary 1) and in there will be 30 lines of 1, randomly other than these 32 lines. I tried the below code: what should I add:

row = 256;
col = 256;
mask = zeros(row, col);
mask(:, 113:144) = 1;
figure, imshow(mask);
save("new-created-mask.mat", "mask");

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Answer 1

Voss 2022-4-21

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https://ww2.mathworks.cn/matlabcentral/answers/1701845-creating-a-mat-file-with-binary-mask#answer_947735

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row = 256;
col = 256;
mask = zeros(row, col);
% 32 vertical lines in the middle (or one vertical line 32 columns wide)
mask(:, 113:144) = 1;
% create 30 other vertical lines at random:
idx_avail = 1:col;          % column indexes available for the new random lines
idx_avail(113:144) = [];    % don't allow random lines in the middle
% 30 random numbers chosen from idx_avail without repeats:
% randperm(N_avail,30) returns 30 unique integers between 1 and N_avail, inclusive
% then idx_avail(randperm(__)) converts those to indexes of columns of mask
N_avail = numel(idx_avail);
random_idx = idx_avail(randperm(N_avail,30));
% put the lines in place:
mask(:,random_idx) = 1;
figure, imshow(mask);
save("new-created-mask.mat", "mask");