how can i randomize an image?

Hi, I have an image and I want to randomize it with special seed and convert the original image to random image, after that I should recover the original image. how can I do it? can you guide me???

Answer 1

[Walter Roberson]

special_seed = randi([1 255]);
randomized_image = uint8( mod(double(YourImage)+special_seed, 256) );

[nadia]

is there any function in matlab that convert an image to random image and encrypt the image with specified seed?

[Walter Roberson]

No there is no function provided for that specific purpose. The code I gave above does one kind of randomization. To reverse use -special_seed instead of + it.

Answer 2

[Image Analyst]

See attached demos for random scrambling and scrambling via Arnold's Cat Map.

[Walter Roberson]

Note that the Cat Map does not have a "seed" as such. However, you could randomly select the number of iterations.

[Samaa Yasser]

please can i have the code of scrambling of grey image ?

[Image Analyst]

@Samaa Yasser, see attached m-files.

[Samaa Yasser]

thank you very much