Yizhou Wang Siavosh Bahrami Song Chun Zhu Perceptual Scale Space and its Applications. 58-65 2005 conf/iccv/2005 ICCV http://doi.ieeecomputersociety.org/10.1109/ICCV.2005.187 db/conf/iccv/iccv2005-1.html#WangBZ05