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Quad-tree structures are often used to model motion between frames of a video sequence. However, a fundamental limitation of the quadtree structure is that it can only capture horizontal and vertical edge discontinuities at dyadically related locations. In this paper we seek to address this limitation by introducing geometry information into the nodes of a pruned quad-tree. We start with a typical optimally pruned quad-tree where each node is allowed to model motion. Then for each node in thedoi:10.1109/icip.2007.4379151 dblp:conf/icip/MathewT07 fatcat:42owi77omjghbcpits4p5hudi4