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A homography-based multiple-camera person-tracking algorithm

Posted on:2009-07-14Degree:M.SType:Thesis
University:Rochester Institute of TechnologyCandidate:Turk, Matthew RobertFull Text:PDF
GTID:2448390005456144Subject:Engineering
Abstract/Summary:
It is easy to install multiple inexpensive video surveillance cameras around an area. However, multiple-camera tracking is still a developing field. Surveillance products that can be produced with multiple video cameras include camera cueing, wide-area traffic analysis, tracking in the presence of occlusions, and tracking with in-scene entrances.;All of these products require solving the consistent labelling problem. This means giving the same meta-target tracking label to all projections of a real-world target in the various cameras.;This thesis covers the implementation and testing of a multiple-camera people-tracking algorithm. First, a shape-matching single-camera tracking algorithm was partially re-implemented so that it worked on test videos. The outputs of the single-camera trackers are the inputs of the multiple-camera tracker. The algorithm finds the feet feature of each target: a pixel corresponding to a point on a ground plane directly below the target. Field of view lines are found and used to create initial meta-target associations. Meta-targets then drop a series of markers as they move, and from these a homography is calculated. The homography-based tracker then refines the list of meta-targets and creates new meta-targets as required.;Testing shows that the algorithm solves the consistent labelling problem and requires few edge events as part of the learning process. The homography-based matcher was shown to completely overcome partial and full target occlusions in one of a pair of cameras.
Keywords/Search Tags:Tracking, Multiple-camera, Homography-based, Cameras, Algorithm, Target
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