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中文摘要：
提出一种基于MPEG-4码流的视频水印算法．该算法将离散余弦变换（discrete cosine transform，DCT）与运动矢量相结合．对水印图像进行离散小波变换，将小波变换后水印图像的低频系数嵌入到视频序列I帧DCT变换后的低频系数中，而将小波变换后水印图像的中频系数嵌入到B帧的运动矢量中．实验证明，该算法既保证水印的不可见性，又可增强水印的嵌入强度和鲁棒性．
英文摘要：
A new digital video watermarking algorithm based on MPEG-4 stream was proposed. The watermark signal was transformed into wavelet coefficients. The low frequency band in wavelet coefficients was embedded into the low frequency band in DCT coefficients of I frame. The motion vector of B frame was designed to host the mid-requency band in wavelet coefficients. The experimental results demonstrate that the robustness and intensity of watermark is improved with desirable invisibility.
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