传统的背景帧差法采用的是背景图像与当前帧图像的灰度差值来实现。但是当车辆与背景的灰度非常接近时，容易-Three difference method to quickly and effectively from the background and detect moving targets, the effect is better than a continuous two differential faster. Traditional background frame difference method used to achieve the background image and the image intensity difference of the current frame. But when the gray of the vehicle and the background is very close, easy to