Erik B. Sudderth Antonio Torralba William T. Freeman Alan S. Willsky Learning Hierarchical Models of Scenes, Objects, and Parts. 1331-1338 2005 conf/iccv/2005 ICCV http://doi.ieeecomputersociety.org/10.1109/ICCV.2005.137 db/conf/iccv/iccv2005-2.html#SudderthTFW05