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We present a unified occlusion model for object instance detection under arbitrary viewpoint. Whereas previous approaches primarily modeled local coherency of occlusions or attempted to learn the structure of occlusions from data, we propose to explicitly model occlusions by reasoning about 3D interactions of objects. Our approach accurately represents occlusions under arbitrary viewpoint without requiring additional training data, which can often be difficult to obtain. We validate our modeldoi:10.1109/cvpr.2012.6248048 dblp:conf/cvpr/HsiaoH12 fatcat:shshsyglubb4pfinvlo4pypeji