a dynamic hierarchical clustering method for trajectory-based unusual video event detection
DESCRIPTION
A Dynamic Hierarchical Clustering Method for Trajectory-Based Unusual Video Event Detection. Fan Jiang, Ying Wu , Senior Member, IEEE, and Aggelos K. Katsaggelos , Fellow, IEEE IEEE TRANSACTIONS ON IMAGE PROCESSING, VOL. 18, NO. 4, APRIL 2009. Introduction. Hidden Markov Model (HMM). - PowerPoint PPT PresentationTRANSCRIPT
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Fan Jiang, Ying Wu, Senior Member, IEEE, and
Aggelos K. Katsaggelos, Fellow, IEEEIEEE TRANSACTIONS ON IMAGE
PROCESSING, VOL. 18, NO. 4, APRIL 2009
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IntroductionHidden Markov Model (HMM)
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Cross Likelihood Ratio (CLR)X = training trajectoryY = likelihood trajectoryλx, λy = HMM of X or Y
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Bayesian Information Criterion (BIC)
Dissimilarity
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TRAJECTORY CLUSTERINGDynamic hierarchical clustering (DHC)
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Fifteen categories of any three trajectory groups according to different nearest neighbors
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Merging can be rejected (exclusion) if
Substituting BIC
Where :
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Assume :
Sufficient condition to be satisfied
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2-depth greedy search algorithm
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NORMAL CLUSTER IDENTIFICATION ANDABNORMALITY DETECTION
If
then trajectory i is unusual
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Examples of normal (a)–(d) and unusual (e)–(h) trajectories.
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Thank You