Recognizing events in an automated surveillance system

Authors:
Birant Örten;A. Aydın Alatan;Tolga Çiloğlu
Affiliations:
Electrical and Computer Engineering Department, Boston University, Boston, MA;Dept. of Electrical and Electronics Engineering, M.E.T.U., TR-06531, Ankara, Turkey;Dept. of Electrical and Electronics Engineering, M.E.T.U., TR-06531, Ankara, Turkey
Venue:
MRCS'06 Proceedings of the 2006 international conference on Multimedia Content Representation, Classification and Security
Year:
2006

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Abstract

Event recognition is probably the ultimate purpose of an automated surveillance system. In this paper, hidden Markov models (HMM) are utilized to recognize the nature of an event occurring in a scene. For this purpose, object trajectories, which are obtained through a successful track, are obtained as a sequence of flow vectors that contain instantaneous velocity and location information. These vectors are clustered by K-means algorithm to obtain a prototype representation. HMMs are trained with sequences obtained from usual motion patterns and abnormality is detected by measuring distances to these models. In order to specify the number of models automatically, a novel approach is proposed which utilizes the clues provided by centroid clustering. Preliminary experimental results are promising for detecting abnormal events.