Change Detection in a 3-d World

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 that 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 (egomotion 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 ...

• Type: Conference
• Year: 2007
• Where: CVPR
• Authors: Thomas Pollard, Joseph L. Mundy
• Keywords: 3-d Scene Geometry, Appearance Changes, Change Detection Accuracy, Change Detection Algorithms, Change Detection Problem, Computer Vision, CVPR 2007