利用图像序列的灰度统计特性来提取背景图像，并利用Surendra背景更新算法根据每帧图像对背景进行更新已获得可靠的背景．然后，将当前帧与背景作差，并对差值图像进行适当处理，这样运动目标就能够被精确地提取出来．

-Using statistical properties of image sequences to extract the gray background image and background updating algorithm based on the use Surendra each frame to update the background has been a reliable background. Then, the difference between the current frame and background, and difference images properly, this moving target can be accurately extracted.