perform diffusion of image pixels

0 down vote favorite I have an image say I, I apply a transformation called Multi resolution Singular value decomposition on it. By this, I decompose the images into 4 parts. The first parts are the approximation part that has floating point values, and the other three are the detailed part. I need to implement an encryption scheme on this detailed part. For this purpose, I need to perform diffusion of pixel by some chaotic map. But the main problem is that need an in-between step that requires bit-Xor of values in the approximation part. Is there some process by which I can convert these floating values in the range [0,255] and then perform my bit-xoring with the constraint that after inverse diffusion i get back the same floating point values or PSNR of the reconstructed image should be as high as possible, i.e data loss should be minimal.

Answer 1

[Image Analyst]

There is a bitxor() function that you can use.

[myetceteramail myetceteramail]

but bitxor cant perfom on floating points