Method of watermarking based on drift compensation

The quality of the picture of the P frame and B frame is affected,if watermark is embedded in I frame in the compressed video MPEG-2 bit-stream.In this paper,the method of the novel drift compensation is proposed to decrease this influence.It is turned out that this method evidently improves the quality of the picture of the P frame and B frame,at the same time,the needed computation power of this method is small.