Andreas Turina Tinne Tuytelaars Luc J. Van Gool Efficient Grouping under Perspective Skew. 247-254 2001 conf/cvpr/2001 CVPR (1) http://doi.ieeecomputersociety.org/10.1109/CVPR.2001.990483 db/conf/cvpr/cvpr2001-1.html#TurinaTG01