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Real-time traffic data collection is the traffic control department of vehicle management research one of the key issues, using image processing methods for crowd monitoring study at home and abroad have been, but in the monitoring of complex scenes is not satisfactory. In this paper, ordinary CCD acquisition image, an integrated inter-frame image differences and eliminate the background image of the technology to effectively deal with detection of image movement groups, to overcome the traditional methods that exist in the measurement error, and based on the prospects for the detection of images with the entire image area of effective area in proportion to estimate the current number of images in the crowd