Takayuki Okatani Koichiro Deguchi On Photometric Aspects of Catadioptric Cameras. 1106-1113 2001 conf/cvpr/2001 CVPR (1) http://doi.ieeecomputersociety.org/10.1109/CVPR.2001.990654 db/conf/cvpr/cvpr2001-1.html#OkataniD01