Image encryption in MATLAB

Question

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which is the simplest key-less image encryption or scrambling technique?

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Answer 1

Jan 2013-8-7

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It depends on what "simple" means. Perhaps:

image  = rand(100, 100, 3);
stream = typecast(image, 'uint8');
for k = 2:numel(stream)
  stream(k) = xor(stream(k), stream(k - 1));
end

There are so many other simple methods, that I cannot imagine, that you won't find dozens more by your own.

vardhit 2013-8-7

??? Error using ==> typecast The first input argument must be a vector.

Error in ==> Untitled3 at 2 stream = typecast(image, 'uint8');

Jan 2013-8-7

As the error message implies: Make it a vector:

stream = typecast(image(:), 'uint8');