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This paper presents a novel approach to the detection of unusual or interesting events in videos involving certain types of intentional behaviour, such as pedestrian scenes. The approach is not based upon a statistical measure of typicality, but upon building an understanding of the way people navigate towards a goal. The activity of agents moving around within the scene is evaluated based upon whether the behaviour in question is consistent with a simple model of goal-directed behaviour and adoi:10.5244/c.18.50 dblp:conf/bmvc/DeeH04 fatcat:5imm6lorpnat3ol3ym2ejrkyxq