基于运动矢量的视频可逆隐藏算法

Video reversible data hiding algorithm based on motion vector

针对现有的基于运动矢量的视频信息隐藏算法存在破坏矢量局部最优性这一问题,提出一种基于视频运动矢量的可逆信息隐藏算法。算法对利用增强预测区域搜索(enhance predictive zonal search,EPZS)算法得到的最优预测矢量与运动矢量的差值进行微调,在差值的最低有效位嵌入水印。通过矢量差值扩展,实现了解码端运动矢量的无损恢复,让信息的嵌入不影响矢量的局部最优性,保证了解码视频质量不受运动矢量改变的影响。与传统的基于运动矢量的信息隐藏算法相比,本算法在嵌入水印的同时未大幅增加引入码流量。实验结果表明,该算法在控制码流和解码端的视频质量方面均具有良好的性能。

The existing motion vector-based video information hiding algorithm can damage the local optimality of vector.In view of this problem,a reversible information hiding algorithm based on video motion vector was proposed in this paper.Fine tuning was made according to the difference between the optimal predictive vector and the motion vector obtained by using the enhance predictive zonal search(EPZS)algorithm and the watermark was embedded at the lowest significant bit of the difference.By using vector difference to extend,lossless recovery of motion vector at the decoder was obtained,thus preventing the local optimality of the vector from being affected by the embedded information and protecting the decoded video quality from the change in the motion vector.Compared with the traditional information hiding algorithm based on motion vector,the proposed algorithm did not introduce large code stream sizes in the process of watermark embedding.The experimental results show that the proposed algorithm has good performance in controlling code stream and video quality in the decoder.