通过对每帧的图像与背景模型进行对比，进而提取前景目标(By comparing the image of each frame with the background model, the foreground target is extracted)

通过背景差分法获取运动目标检测，提取前景目标，转化成二值图(The moving target detection is obtained by the background difference method, and the foreground object is extracted and transformed into a two value graph.)