基于H.264抗重压缩的视频水印算法  

A VIDEO WATERMARKING ALGORITHM AGAINST RE-COMPRESSION BASED ON H.264

作　　者：刘凯 李晨[1] 田丽华[1] 张玉龙[1] 宋慧 Liu Kai;Li Chen;Tian Lihua;Zhang Yulong;Song Hui(School of Software Engineering,Xi an Jiaotong University,Xi an 710049,Shaanxi,China;School of Information,Engineering University of PAP,Xi an 710086,Shaanxi,China)

机构地区：[1]西安交通大学软件学院,陕西西安710049 [2]武警工程大学信息工程学院,陕西西安710086

出　　处：《计算机应用与软件》2018年第12期163-168,共6页Computer Applications and Software

基　　金：国家自然科学基金项目(61573273);中央高校基本科研业务费专项资金资助项目(XJJ2016029)

摘　　要：随着H.264/AVC技术在视频领域应用的越来越广,研究基于H. 264的视频水印技术具有重要的意义。但目前很多基于H. 264的视频水印算法抗重压缩性能不佳,这严重影响了水印算法的实用性。针对H. 264重压缩的特点进行分析,提出一种基于色度DCT系数的视频水印算法。选择色度DCT非零系数符合要求的4×4子块;通过调整中频非零系数的正负号来实现水印的嵌入。实验结果表明,嵌入水印后视频的视觉质量基本不受影响,并且该算法对视频的比特率较小。同时该算法具有良好的抗重压缩的能力。With the increasing application of H.264/AVC in the field of video, it has great significance to research video watermarking based on H.264/AVC. However, many existing algorithms of video watermarking based on H.264 have poor performance of to resist re-compression, which seriously affects the application of the watermarking algorithm. In the paper, we analyzed the characteristics of H.264 re-compression and proposed a video watermarking algorithm based on chroma DCT coefficients. The 4×4 sub blocks whose chromatic DCT non-zero coefficients met the certain demand were selected. The signs of the non-zero coefficients in the medium frequency were modulated to embed watermarks. The experimental results show that the visual quality of the embedded watermark video is almost unaffected, and the bit rate of the algorithm is small. The algorithm has a better ability to resist re-compression.

关 键 词：视频水印 H.264/AVC DCT 抗重压缩 预测模式 

分 类 号：TP313[自动化与计算机技术—计算机软件与理论]