The scene monitored by intelligent video is stable most of the time and slow changing temporarily.In order to stably and precisely extract the background from the video stream

a background extract algorithm based on the scene distinction has been presented.The mixture of Gaussians and Kalman filter are employed to process and model the stationary parts and slow changing parts separately

and then the scene discrimination algorithm is used to extract the background by processing the result of those two models.Experimental results indicate that the method can stably extract relative precise background from the video stream.