Margarita Osadchy Michael Lindenbaum David W. Jacobs Whitening for Photometric Comparison of Smooth Surfaces under Varying Illumination. 217-228 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3024&spage=217 2004 conf/eccv/2004-4 ECCV (4) db/conf/eccv/eccv2004-4.html#OsadchyLJ04