2-D adaptive noise-removal filtering

Modified version of WIENER2 from image toolbox with proper noise estimation

WIENERC modifies the WIENER2 function from the MATLAB image toolbox to provide proper noise estimation (assuming additive Gaussian noise)

Four noise methods implemented:

-Mode of local variance (recommended)
-Median of local variance
-Minimum of local variance
-Median absolute deviation based.

Methods proposed in:

S. Aja-Fernández, G. vegas-Sanchez-Ferrero, M. Martín-Fernández and C. Alberola-López, "Automatic Noise Estimation in Images Using Local Statistics. Additive and Multiplicative Cases". Image and Vision Computing, Vol. 27, Issue 6, May 2009, pp. 756-770.