# Random shuffle of image pixels/ Image scrambling

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marie lasz am 8 Sep. 2020
Kommentiert: marie lasz am 28 Dez. 2020
hello,
I am applying arnold transform method on an image to scramble its pixels. And i am doing it successfully but the problem in this method is that first I have to binarize the image before applying this method and that is why I am getting binarized image in a result in inverse of arnold transform. So, my question is that is there any other method in which I scramble or shuffle pixels by setting a key value without binarizing the image? so that I would be able to revert the image back ?
thank you very much :-)
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### Antworten (1)

Sindar am 9 Sep. 2020
You can use randperm to shuffle the indices randomly, then sort to get the indices for reversing it:
% load in an image included in Matlab
% get the size
imsize = size(corn_gray);
% display
imshow(corn_gray)
% create a randomly-shuffled list of linear indices 1:total pixels
idx_shuffle=randperm(numel(corn_gray));
% get the inverse (idx_shuffle(idx_unshuffle) = 1:total pixels)
[~,idx_unshuffle] = sort(idx_shuffle);
% put the indices into the same row-col shape as the image
idx_shuffle = reshape(idx_shuffle,imsize);
idx_unshuffle = reshape(idx_unshuffle,imsize);
% compute the shuffled image
corn_gray_shuffled = corn_gray(idx_shuffle);
% run an arbitrary transformation on it
corn_gray_shuffled = corn_gray_shuffled.^2;
% display the shuffled, transformed image
imshow(corn_gray_shuffled)
% unshuffle the transformed image
corn_gray_unshuffled = corn_gray_shuffled(idx_unshuffle);
% and display
imshow(corn_gray_unshuffled)
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marie lasz am 28 Dez. 2020
@Faizan, No I didn't. But I am working with Arnold.

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