A Dynamic Hierarchical Clustering Method for Trajectory-Based Unusual Video Event Detection
Fan Jiang, Ying Nian Wu, Aggelos K. Katsaggelos · IEEE Transactions on Image Processing · 2009
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.