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pseudo-random permutation[lfsr]

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dlna

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lfsr random

hi,
im working on the image watermarking proj. i want to know what is meant by 'permute a image to disperse its spatial relationship'. could you please help me..

and

the use of linear feedbackshift register (14bit) is known. any matlab code to permute a selected image using lfsr will be helpful.

thanks
 

permutations lfsr

thanks, I was able to generate a a pseudo random sequence.
now, how do i permute the image? do i need to permute the image.. please help i have no idea.

thanks
 

lfsr matlab

Well, the simplest way is to permute image brightness by XOR operation

You reorder image samples in 1-dimension sequence by scanning and XOR them by random sequence

Then You can restore image by XOR as well
 

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    dlna

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thank you very much, great help!!
 

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