Patent ID: 7433493

Claim:
An abnormal behavior detector characterized in that it is equipped with a video input means for acquiring video data of moving objects and creating full-motion video data thereof from the acquired source video data, a position/moving direction calculation means for calculating the positions and moving directions of said moving objects from one of the freeze frames of video data included in said full-motion video data, an abnormality origin detection means by which the place of occurrence of the abnormality causing the abnormal behavior of said moving objects is estimated from said positions and moving directions, and an output means for displaying the above-estimated place of occurrence of the abnormality, wherein said abnormal behavior detector is characterized in that the said abnormality origin detection means, after assuming that the behavior of moving objects is governed by both a behavior algorithm which is a judgment procedure concerning the determination of the behavior of the moving objects, and control parameters which are the parameters functioning as the criteria for judgment, estimates said control parameters from said positions and said moving directions and then estimates from said control parameters the object that has caused the abnormal behavior, and wherein said abnormal behavior detector is characterized in that during the calculation of said control parameters, these control parameters are estimated so as to minimize the differences between said moving directions of said moving objects and the virtual moving directions determined by said behavior algorithm.