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Fan Jiang; Ying Wu; Katsaggelos, A.K.
IEEE transactions on image processing, 04/2009, Letnik: 18, Številka: 4Journal Article
The proposed unusual video event detection method is based on unsupervised clustering of object trajectories, which are modeled by hidden Markov models (HMM). The novelty of the method includes a dynamic hierarchical process incorporated in the trajectory clustering algorithm to prevent model overfitting and a 2-depth greedy search strategy for efficient clustering.
