计算机应用 ›› 2013, Vol. 33 ›› Issue (07): 1866-1869.DOI: 10.11772/j.issn.1001-9081.2013.07.1866

• 信息安全 • 上一篇    下一篇

基于H.264压缩域的视频盲水印算法

刘立冬,田翔   

  1. 浙江大学 数字技术及仪器研究所,杭州 310027
  • 收稿日期:2013-01-28 修回日期:2013-03-07 出版日期:2013-07-01 发布日期:2013-07-06
  • 通讯作者: 刘立冬
  • 作者简介:刘立冬(1986-),男,黑龙江齐齐哈尔人,硕士研究生,主要研究方向:视频编解码、嵌入式系统;田翔(1979-),男,安徽蚌埠人,副教授,博士,主要研究方向:嵌入式系统设计。
  • 基金资助:

    国家自然科学基金仪器专项(40927001);浙江省重点科技创新团队项目(2011R09021-06)

Blind watermarking algorithm in H.264 compressed domain

LIU Lidong,TIAN Xiang   

  1. Institute of Advanced Digital Technology and Instrument, Zhejiang University, Hangzhou Zhejiang 310027, China
  • Received:2013-01-28 Revised:2013-03-07 Online:2013-07-06 Published:2013-07-01
  • Contact: LIU Lidong

摘要: 为了解决H.264视频信息的版权保护问题,提出了一种基于即时解码刷新(IDR)帧离散余弦变换(DCT)域的盲水印算法。该算法首先分析IDR帧的纹理特征,利用滑动矩形窗根据图像的梯度特性提取出复杂纹理区域;然后,计算该区域内每个宏块的16个4×4子块能量,得到能量最高子块;最后,通过自适应修改子块的一个交流(AC)系数幅值以达到嵌入水印的目的。实验结果表明:对CIF分辨率视频测试序列嵌入水印后,视频图像的峰值信噪比(PSNR)平均下降0.15dB,码率平均增加了0.49%,水印检测准确率达到91%以上,并且该算法能够有效抵抗不同量化参数(QP)的重复编码攻击。

关键词: H.264, 盲水印, 离散余弦变换, 帧内预测, 纹理复杂度

Abstract: To solve the problem of H.264 video copyright protection, a new blind watermarking algorithm was proposed. Based on the texture features of the picture, watermarking information was embedded on the Discrete Cosine Transform (DCT) domain of Instantaneous Decoding Refresh (IDR) frames. First, a rectangular sliding window was used to search the region of complex textures. Second, in the selected region, a 4×4 sub-block of maximum energy was chosen for embedding one watermarking bit. Last, one Alternating Current (AC) coefficient value of the selected 4×4 sub-block was modified adaptively. The experimental results show that Peak-Signal-to Noise Ratio (PSNR) decreases 0.15dB and the bitrate rises 0.49% on average, and the accuracy of watermark detection is above 91%; moreover, the algorithm can effectively resist the re-coded attacks of different Quantization Parameter (QP).

Key words: H.264, blind watermarking, Discrete Cosine Transform (DCT), intra predict, texture complexity

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