Hi Arwa, below code might help.
W_log = imread('cameraman.tif');
Key1 = 100;
s = size(W_log);
ss = rng(Key1, 'twister'); % you need to initiate this code every time before scrambling
p = reshape(randperm(numel(W_log)), s);
SW_log = W_log(p);% scrambled logo figure,
imshow(W_log)
title('Original image')
figure
imshow(SW_log)
title('Scrambled image')
% Reconstruction process
original_matrix(p) = SW_log;
original_matrix = reshape(original_matrix, s);
figure
imshow(original_matrix)
title('Reconstructed image')
