Jan-Mark Geusebroek Arnold W. M. Smeulders Joost van de Weijer Fast Anisotropic Gauss Filtering. 99-112 2002 conf/eccv/2002-1 ECCV (1) http://link.springer.de/link/service/series/0558/bibs/2350/23500099.htm db/conf/eccv/eccv2002-1.html#GeusebroekSW02