Fast seamless image cloning by modified Poisson equation

This provides very fast seamless image cloning.

It is the fast Poisson image editing.
Please run demoModPoisson.
This is the matlab implementation of following seamless image cloning:
Takashi Shibata, Masayuki Tanaka, Masatoshi Okutomi,
Multi-spectrum to RGB with direct structure-tensor reconstruction,
Electronic Imaging 2016.
Masayuki Tanaka, Ryo Kamio and Masatoshi Okutomi,
Seamless Image Cloning by a Closed Form Solution of a Modified Poisson Problem,
Proceedings of 5th ACM SIGGRAPH Conference and Exhibition on Computer Graphics and Interactive Techniques in Asia (SIGGRAPH Asia 2012), p.c08-0164-1-1, November, 2012.
Slideshare:
http://www.slideshare.net/masayukitanaka1975/intensity-constrainedgradient-reconstruction