DocumentCode :
870405
Title :
Detecting Dominant Motions in Dense Crowds
Author :
Cheriyadat, Anil M. ; Radke, Richard J.
Author_Institution :
Dept. of Electr., Comput., & Syst. Eng., Rensselaer Polytech. Inst., Troy, NY
Volume :
2
Issue :
4
fYear :
2008
Firstpage :
568
Lastpage :
581
Abstract :
We discuss the problem of detecting dominant motions in dense crowds, a challenging and societally important problem. First, we survey the general literature of computer vision algorithms that deal with crowds of people, including model- and feature-based approaches to segmentation and tracking as well as algorithms that analyze general motion trends. Second, we present a system for automatically identifying dominant motions in a crowded scene. Accurately tracking individual objects in such scenes is difficult due to inter- and intra-object occlusions that cannot be easily resolved. Our approach begins by independently tracking low-level features using optical flow. While many of the feature point tracks are unreliable, we show that they can be clustered into smooth dominant motions using a distance measure for feature trajectories based on longest common subsequences. Results on real video sequences demonstrate that the approach can successfully identify both dominant and anomalous motions in crowded scenes. These fully-automatic algorithms could be easily incorporated into distributed camera networks for autonomous scene analysis.
Keywords :
cameras; computer vision; image motion analysis; image segmentation; image sequences; anomaly detection; autonomous scene analysis; computer vision algorithms; crowded scene; dense crowds; distance measure; distributed camera networks; dominant motion detection; feature point tracks; feature trajectories; image segmentation; inter-object occlusions; intra-object occlusions; optical flow; real video sequences; Algorithm design and analysis; Clustering algorithms; Computer vision; Image motion analysis; Layout; Motion analysis; Motion detection; Tracking; Trajectory; Video sequences; Anomaly detection; clustering; crowd analysis; longest common subsequences; object trajectories;
fLanguage :
English
Journal_Title :
Selected Topics in Signal Processing, IEEE Journal of
Publisher :
ieee
ISSN :
1932-4553
Type :
jour
DOI :
10.1109/JSTSP.2008.2001306
Filename :
4629878
Link To Document :
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