Yifei Lou Paolo Favaro Stefano Soatto Andrea L. Bertozzi Nonlocal Similarity Image Filtering. 62-71 2009 ICIAP http://dx.doi.org/10.1007/978-3-642-04146-4_9 conf/iciap/2009 db/conf/iciap/iciap2009.html#LouFSB09