【摘要】 提出一种改进的基于运动矢量的视频水印方案,该算法有下述优点:①根据水印嵌入容量自适应调整嵌入策略,以满足不可感知性要求;②水印嵌入对差分编码运动矢量造成的误差累积减小;③与MPEG＿2视频编码语义紧密结合。实验证明所提出的视频水印算法具有较低的计算复杂度,对视频码率转换具有高的鲁棒性。更多还原

【Abstract】 An improved video watermarking scheme employing motion vectors is proposed. Compared with similar schemes proposed by Jordan, ZHANG and Dai, respectively, the new one described herein has three merits: （① Embedding ）strategy is adaptively adopted according to the requirement of watermarking capacity to meet the need of imperceptibility; ② The accumulation of differential coding error of motion vectors is reduced;③ Compatible with the syntax of MPEG₂ coding stream. Experimental results have demonstrated that the proposed scheme is of low computational complexity and of high robustness against rate conversion.更多还原