Arnold Cat Map (ACM) Image Permutation MATLAB

I present three Matlab functions:

1- ACM Permutation: Ip = ACM(I,iter), where Ip: Permuted image and iter: number of iterations. iter: is the permutation key.

2- Inverse ACM Permutation: Ir = ACM_inv(Ip,iter), where Ir: recovered image, iter: number of iterations. iter: is the inverse permutation key. To correctly recover the original image, the same key must be used in the two functions.

3- ACM Permutation function and it's inverse for a Color image: Io = ACM_COLOR(I, iter,enc_dec) where Io: output image, iter: number of iterations, and enc_dec = 1 for permutation and 2 for inv. permutation. iter: is the permutation key.