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Detection of Emergency Events in Crowded Scenes

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Original languageEnglish
Title of host publicationCrime and Security, 2006. The Institution of Engineering and Technology Conference on
Number of pages6
Publication statusPublished - 2006


This paper evaluates a technique for detection of abnormal events in crowds. We characterise crowd behaviour by observing the crowd optical flow and use unsupervised feature extraction to encode normal crowd behaviour. The unsupervised feature extraction applies spectral clustering to find the optimal number of models to represent normal motion patterns. The motion models are HMMs to cope with the variable number of motion samples that might be present in each observation window. The results on simulated crowds analyse the robustness of the approach for detecting crowd emergency scenarios observing the crowd at local and global levels. The results on normal real data show the effectiveness in modelling the more diverse behaviour present in normal crowds. These results improve our previous work in the detection of anomalies in pedestrian data.

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