Homomorphic Normalization

Performs homomorphic normalization on a grayscale image.

Homomorphic normalization corrects uneven lighting and enhances textures in an image. It is often used as a preprocessing step for biometric identification.

I thought that all of the homomorphic normalization functions which were available were not written well, so I wrote my own. I can't vouch for the math because I haven't read the original paper (Gross and Brajovic, 2003). I just adapted the math from the function available here: http://www.csse.uwa.edu.au/~pk/research/matlabfns/
I simplified the logic so that the code should make sense to a reasonably experienced matlab user and I put the main function and all of the supporting functions in one file.