基于MPEG-2的视频水印技术研究

【作者】 张桂东；

【导师】 王执铨； 茅耀斌；

【作者基本信息】 南京理工大学 ， 控制理论与控制工程， 2004， 硕士

【摘要】 数字水印技术作为一种新的可以用来解决版权保护问题的有效途径，近年来已成为信息安全领域的研究热点。在各类数字水印技术中，数字视频水印技术由于其自身的研究价值和潜在的经济利益而倍受各国学者的关注。然而，与静态图像水印技术相比，视频水印技术的发展相对滞后。本文重点研究基于MPEG-1／2的数字视频水印算法，并对所提出的算法进行了仿真实验。论文主要的研究工作与创新点如下： (1)系统综述了数字视频水印技术的基本概念、技术要求、典型应用以及国内外研究现状。在介绍现有的各种类型视频水印算法的同时，对视频水印技术的攻击方法、评价基准做了详尽的介绍。 (2)利用人类视觉模型，提出一种新颖的基于MPEG-2运动矢量(MV)的视频水印方案，通过修改运动矢量的水平或垂直分量达到嵌入水印的目的。实验结果表明嵌入的水印具有较好的不可感知性，同时算法对于压缩攻击具有较好的鲁棒性。 (3)深入研究了视频认证水印系统，提出一种针对视频对象感兴趣区域的半脆弱视频认证方案。实验结果表明该算法对视频对象被恶意篡改位置的检出率很高。同时算法的安全性依赖于密钥，可以实现真正意义上的盲检测。更多还原

【Abstract】 As a new and effective approach to solve the problem of copyright protection, digital watermarking has emerged to be an active and flourishing research topic in the field of information security recently. Among the plethora of digital watermarking techniques, researchers have paid more attention to video watermarking technique because of its high research value and potential commercial profits. However, currently available video watermarking technique is far beyond mature yet compared with the still image watermarking. This thesis focuses on video watermarking algorithms based on MPEG- 1/2 and experiments are performed to test the effectiveness of the proposed algorithms. The main research work and contributions of this thesis are summarized as follows:(1) This thesis systematically summarizes the concepts, the technique requirements, the typical applications and the research status of video watermarking techniques and classifies attacks and benchmarks of the video watermarking techniques as well as focuses the research on all kinds of proposed video watermarking algorithms.(2) Based on the HVS (Human Visual System) model, this thesis proposed a novel video watermarking algorithm using motion vector for MPEG-2 video stream, which by adjusting the horizontal or vertical component value of motion vector to embed the watermark information. Experimental results show that the embedded watermarks are imperceptible and robust against the attack of compression.(3) The author researches the watermarking systems for video authentication deeply and proposes a novel watermarking scheme for video authentication to protect the region of interest. Experimental results show that it can detect a modification place on the video object very well. The security of algorithm relies on the key and it can fulfill blind detection.更多还原