Yasushi Makihara Yasushi Yagi Silhouette extraction based on iterative spatio-temporal local color transformation and graph-cut segmentation. 1-4 2008 ICPR http://dx.doi.org/10.1109/ICPR.2008.4761121 conf/icpr/2008 db/conf/icpr/icpr2008.html#MakiharaY08