This is a program find matches by Multi-Scale Multi-Window correlation.
It is based on algorithms developed by Antoni Buades and Gabriele Facciolo.
The optimized SIMD implementation here is by Marc Lebrun.

This program is used inside the s2p satellite stereo pipeline
http://github.com/cmla/s2p

For a full git history and blame, look at the s2p commit history before the
"c/msmw" folder was removed from the tree.
