Xiang Gao Visvanathan Ramesh Terrance E. Boult Statistical Characterization of Morphological Operator Sequences. 590-605 2002 conf/eccv/2002-4 ECCV (4) http://link.springer.de/link/service/series/0558/bibs/2353/23530590.htm db/conf/eccv/eccv2002-4.html#GaoRB02