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i want a randomly scramble of a divided image into 4 blocks

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Samaa Yasser
Samaa Yasser 2021-4-23
编辑： Matt J 2021-4-23
please if i have image 256X256 and i divided it into 4 blocks, how can i scramble the blocks randomly or change the orders of the 4 blocks ,then i stitch them together again after this permutation or this changing inorder to change the parameters of the image and got a cihper one??
should i convert it to vector and then permuted or i can permuted it in blocks case?? please i want the code

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回答（2 个）

Matt J
Matt J 2021-4-23
编辑：Matt J 2021-4-23
Ran in:
Using mat2tiles (which you must Download),
Image=imresize(imread('saturn.png'), [256,256]);
im=mat2tiles(Image,[128,128,inf]);
newImage=cell2mat( im(randperm(256/128), randperm(256/128)) );
subplot(1,2,1),imshow(Image);
subplot(1,2,2), imshow(newImage)
Jan
Jan 2021-4-23
编辑：Jan 2021-4-23
img = uint8(((0:255) + (0:255).') / 2); % Test image
s = size(img);
% Split image to blocks:
img4 = reshape(img, s(1) / 2, 2, s(2) / 2, 2);
img4 = permute(img4, [1, 3, 2, 4]);
img4 = reshape(img4, s(1)/2, s(2)/2, 4);
% Mix:
img4 = img4(:, :, randperm(4));
% Get matrix again:
img4 = reshape(img4, s(1)/2, s(2)/2, 2, 2);
img4 = permute(img4, [1, 3, 2, 4]);
result = reshape(img4, s);
imagesc(result)
Or:
img = uint8(((0:255) + (0:255).') / 2); % Test image
s = size(img);
C = mat2cell(img, [s(1)/2, s(1)/2], [s(2)/2, s(2)/2]);
C(:) = C(randperm(4));
result = cell2mat(C);
imagesc(result)

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