Background modeling methods based on two-stage strategy

To solve the problem of background image during traffic jam, the background modeling method based on two-stage selection strategy is presented. The first selection of image frame is performed according to the degree of traffic congestion which is measured by the variance value of the image frame, then the secondary pixel-wise selection is performed by frame difference method to exclude the motion pixels of the candidate image frame. To estimate the background image value of each pixel, the median method is adopted, therefore, a better background image could be obtained in a short time even in the traffic jam.