Global Behaviour Inference using Probabilistic Latent Semantic Analysis

We present a novel framework for inferring global behaviour patterns through modelling behaviour correlations in a wide-area scene and detecting any anomaly in behaviours occurring both locally and globally. Specifically, we propose a semantic scene segmentation model to decompose a wide-area scene into regions where behaviours share similar characteristic and are rep- resented as classes of video events bearing similar features. To model be- havioural correlations globally, we investigate both a probabilistic Latent Se- mantic Analysis (pLSA) model and a two-stage hierarchical pLSA model for global behaviour inference and anomaly detection. The proposed framework is validated by experiments using complex crowded outdoor scenes.