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2007 IEEE Conference on Computer Vision and Pattern Recognition
Change Detection in a 3-d World
Minneapolis, MN, USA
June 17-June 22
ISBN: 1-4244-1179-3
Thomas Pollard, Brown University, Providence, RI 02912
Joseph L. Mundy, Brown University, Providence, RI 02912
This paper examines the problem of detecting changes in a 3-d scene from a sequence of images, taken by cameras with arbitrary but known pose. No prior knowledge of the state of normal appearance and geometry of object surfaces is assumed, and abnormal changes can occur in any image of the sequence. To the authors' knowledge, this paper is the first to address the change detection problem in such a general framework. Existing change detection algorithms tat exploit multiple image viewpoints typically can detect only motion changes or assume a planar world geometry which cannot cope effectively with appearance changes due to occlusion and un-modeled 3-d scene geometry (ego-motion parallax). The approach presented here can manage the complications of unknown and sometimes changing world surfaces by maintaining a 3-d voxel-based model, where probability distributions for surface occupancy and image appearance are stored in each voxel. The probability distributions at each voxel are continuously updated as new images are received. The key question of convergence of this joint estimation problem is answered by a formal proof based on realistic assumptions about the nature of real world scenes. A series of experiments are presented that evaluate change detection accuracy under laboratory-controlled controlled conditions as well as aerial reconnaissance scnarios.
Thomas Pollard, Joseph L. Mundy, "Change Detection in a 3-d World," cvpr, pp.1-6, 2007 IEEE Conference on Computer Vision and Pattern Recognition, 2007
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