1、 I 数字视频水印的设计与实现 摘 要 数字水印技术是目前信息安全领域研究的一个热点，而数字视频水印能为数字视频提 供一种版权保护方案。数字视频在多媒体产品中占有较大的比重，目前数字视频水印是多 媒体数字水印技术研究方向中当前的一个重点和难点，因此研究数字视频水印具有较强的 现实意义。本文对数字视频水印的研究意义和视频水印的研究现状作了概述，介绍了视频 水印的模型与应用、视频水印的主要特征、技术分类，进而提出了一种基于分块 DCT 变换 和 Arnold 置乱变换的视频水印算法，该算法在水印嵌入过程中充分考虑了人类视觉系统 (HVS)的特点， 在DCT块中嵌入水印信息， 从而使算法具有一定的抗
2、攻击能力。 最后用MATLAB 实现了视频水印的嵌入和检测， 以及对视频水印进行信号处理攻击、 几何攻击和同步攻击， 比较攻击前后视频的变化并对视频水印进行性能评价。实验结果表明，本文所提出的视频 水印算法对椒盐噪声、高斯噪声、丢帧、帧平移和帧交换具有良好的鲁棒性，这对数字视 频水印的进一步研究具有一定的参考价值。 关键词：数字水印；离散余弦变换（DCT）；分块；视频；Arnold置乱 II Design and Implementation of Digital Video watermarking Abstract Digital Watermarking Technique is one
3、 of the hottest topics in the information security field. It provides a kind of right protect scheme for digital videos, which takes up a relative major proportion in multimedia products. At present, Digital video watermarking is an important and difficult part of the multimedia digital watermarking
4、 field. Therefore, it is significant to do some researches in Digital video watermarking field. This paper summaries the significance and the current situation of studying video watermarking, introduces the model and application and its major characteristics and classification of technology. Then we
5、 put forward a video watermarking algorithm based on Block DCT and Arnold transformation. This algorithm takes fully consideration of the features of HVS in the course of embedding watermarking and embeds watermarking information in block DCT, so that it has a certain anti-attacking ability. Finally
6、, we uses MA TLAB to realize the embedment and extraction of video watermarking, as well as carry out the signal processing attacks, geometric attacks, synchronization attacks to watermarked videos , compares the changes of the video before and after attacking. Experiments result show that it has certain referenced value to the further study of digital video watermarking. Keywords : Digital watermarking; discrete cosine transform(DCT); block; video; Arnold scrambling 目 录 摘要 . ABSTRACT . 1 引
