Bogdan Smolka Kostas N. Plataniotis On the Coupled Forward and Backward Anisotropic Diffusion Scheme for Color Image Enhancement. 70-80 2002 conf/civr/2002 CIVR http://link.springer.de/link/service/series/0558/bibs/2383/23830070.htm db/conf/civr/civr2002.html#SmolkaP02