Non local image denoising

Description

Implementation of the Non local filter proposed for A. Buades, B. Coll and J.M. Morel in
“A non-local algorithm for image denoising“

Buades, Antoni, Bartomeu Coll, and J-M. Morel. “A non-local algorithm for image denoising.” Computer Vision and Pattern Recognition, 2005. CVPR 2005. IEEE Computer Society Conference on. Vol. 2. IEEE, 2005.

Directional image filtering

https://en.wikipedia.org/wiki/Non-local_means