Olivier Lezoray Sébastien Bougleux Abderrahim Elmoataz Parameterless Discrete Regularization on Graphs for Color Image Filtering. 46-57 2007 conf/iciar/2007 ICIAR https://doi.org/10.1007/978-3-540-74260-9_5 db/conf/iciar/iciar2007.html#LezorayBE07