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According to the monitoring camera along the highway, to collect the image of the video image monitoring, Through the analysis and processing of video image features, to establish the relationship between the image and the real scene, According to the characteristics of the image changes with the real scene, By the method of image processing, such as gray-scale transformation, image segmentation and feature extraction for image processing of the image, Using the proposed algorithm Maldives, The target and background are extracted, and the background difference is calculated one by one, Can the car position change monitoring image exactly, and determine the target location, and then determine the size of visibility.