Journal
PATTERN RECOGNITION LETTERS
Volume 28, Issue 10, Pages 1232-1239Publisher
ELSEVIER
DOI: 10.1016/j.patrec.2007.02.008
Keywords
person tracking; optical flow; motion detection
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Optical flow can be used to segment a moving object from its background provided the velocity of the object is distinguishable from that of the background, and has expected characteristics. Existing optical flow techniques often detect flow (and thus the object) in the background. To overcome this, we propose a new optical flow technique, which only determines optical flow in regions of motion. We also propose a method by which output from a tracking system can be fed back into the motion segmenter/optical flow system to reinforce the detected motion, or aid in predicting the optical flow. This technique has been developed for use in person tracking systems, and our testing shows that for this application it is more effective than other commonly used optical flow techniques. When tested within a tracking system, it works with an average position error of less than six and a half pixels, outperforming the current CAVIAR, benchmark system. (C)2007 Elsevier B.V. All rights reserved.
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