Robust real-time periodic motion detection, analysis, andapplications
Cutler, R.; Davis, L.S.
Pattern Analysis and Machine Intelligence, IEEE Transactions on
Volume 22, Issue 8, Aug 2000 Page(s):781 - 796
Digital Object Identifier   10.1109/34.868681
Summary:We describe new techniques to detect and analyze periodic motion as seen from both a static and a moving camera. By tracking objects of interest, we compute an object's self-similarity as it evolves in time. For periodic motion, the self-similarity measure is also periodic and we apply time-frequency analysis to detect and characterize the periodic motion. The periodicity is also analyzed robustly using the 2D lattice structures inherent in similarity matrices. A real-time system has been implemented to track and classify objects using periodicity. Examples of object classification (people, running dogs, vehicles), person counting, and nonstationary periodicity are provided

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