Video Watermarking Technique

This paper presents a video watermarking technology based on the MPEG-2 standard and the expansive frequency technique.The watermarks are embedded in the chroma's DCT direct current coefficient of the video's 'I' frames.It need not to decode fully when the watermarking is embedded and extracted.As a result,the complication of operation is predigested and the capability of real time is improved.Furthermore,because the wartermarking is embedded in the chroma's DCT direct current coefficient,based on the premise that the video effect is not distorted,the watermarking is steady.