Hiroshi Ishikawa 0002 Davi Geiger Richard Cole Finding Tree Structures by Grouping Symmetries. 1132-1139 2005 conf/iccv/2005 ICCV http://doi.ieeecomputersociety.org/10.1109/ICCV.2005.100 db/conf/iccv/iccv2005-2.html#IshikawaGC05