毕业论文数字水印设计.doc

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摘 要
数字水印是一种嵌入到图像、视频或者音频数据中的标志，通过对水印信息的检测可以达到保护多媒体数据版权的目的。近年来，数字水印技术得到了较大的发展，基于变换域特别是基于DCT的水印技术是目前研究的热点，并且目前DCT编码在JPEG、MPEG、H.26x等编码标准都中有着广泛的应用。本课题针对基于DCT的视频水印算法进行研究,在简要介绍本课题研究背景与本课题的国内外研究动态的基础上，随后介绍了数字水印技术的应用、特点和攻击方法与视频水印的特点及其国内外发展动态。本文重点对基于DCT的低频水印算法、基于DCT的中频水印算法和基于DCT的自适应视频水印算法进行了深入分析与研究，使用伪码对这三种算法进行了简单的实现。对基于DCT的中频水印算法进行了改进，在改进算法中对水印序列进行了扩频，并对DCT变换后中频系数的处理进行了改进。最后，在MATLAB中对水印的嵌入 、水印的检测与水印的剪切攻击进行了实验。
关键词:DCT；水印；视频；低频；中频；

Abstract
Digital watermarking techniques have been proposed as a solution to the problem of copyright protection of multimedia documents. Digital watermark is mark embedded in digital image, video or audio documents, which can be detected to protect copyright of multimedia data. Digital watermarking techniques have greatly developed in recent years. Watermarking techniques based on the transformation domain has become a heated issue in the academic research of the field, and DCT (Discrete Cosine Transform) transforming coding has been widely used coding standards such as JPEG, MPEG and H.26x at present. The subject is mainly propose the DCT-based video digital watermarking，in briefly introduced the background research and domestic and foreign research dynamic of the subject. Afterwards introduced the application, the characteristic and the attack method of digital watermarking technology and the video digital watermarking characteristic and its the domestic and foreign development tendency. The article principally researches and analyzes an intermediate frequency DCT-based watermarking algorithm, a low frequency DCT-based digital algorithm and a DCT-based transforming watermarking algorithm, To has made an improvement to the DCT- based intermediate frequency watermarking algorithm, has carried on the wide frequency to the watermark sequence in the improvement algorithm, and has made an improvement to intermediate frequency coefficient processing after the DCT transformation. Finally, haven the experiment in MATLAB about imbedding watermarking, detecting watermarking and cutting attacks.
Key words: DCT；Watermarking；video；

目 录
摘 要I
AbstractII
1 绪论1
1.1 本课题研究背景1
1.2 本课题的国内外研究现状1
1.3 本课题的主要内容3
2 数字水印技术4
2.1数字水印的概念4
2.2水印的应用4
2.3 水印的特征5
2.4水印攻击6
3 视频水印技术8
3.1 视频水印技术的特点8
3.2 目前视频水印的主要嵌入和提取方案8
4基于DCT的低频水印算法14
4.1 算法的基本原理14
4.2 代码实现15
4.3 算法分析21
5 基于DCT的中频水印算法22
5.1 算法的基本原理22
5.2 原始算法代码实现23
5.3 原始算法分析28
5.4 算法改进29
4.5 改进算法代码实现30
6 基于DCT的自适应视频水印方案32
6.1 基本原理32
6.2 代码实现34
7 总结与展望36
参考文献39
致 谢40