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.
作者
刘凯
李晨
田丽华
张玉龙
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)
出处
《计算机应用与软件》
北大核心
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)
作者简介
刘凯 ，硕士生，主要领域：视频水印。;李晨 ，讲师。;田丽华 ，高工。;张玉龙 ，工程师。;宋慧 ，助教。
