一种基于DCT域图像数字水印算法的设计与实现

论文字数:12584,页数:33  有开题报告，任务书

摘    要
 数字作品引发的盗版问题和版权纷争已成为日益严重的社会问题的今天，数字水印是实现数字产品版权保护和安全维护的有效办法，其在所有权水印标记搜索、拷贝控制、指纹识别等多方面都得以应用。
 针对图像的水印方案是最近几年研究的主流方向，本文重点研究了基于DCT域的图像数字水印的设计和实现方法。第一章介绍了数字水印目前的研究现状，并简单描述了将实现的图像数字水印系统的构思和预期目标；第二章介绍了本文所涉及的主要相关知识和技术；第三章讨论选择MATLAB作为实现系统的工具的目的和优势以及系统环境配置；第四章为本论文的主要部分，是系统实现的具体过程，包括主要步骤水印嵌入、水印提取、水印检测。从实验结果看，系统能保证水印的不可见性，并保持较好的鲁棒性，即使在攻击下仍有不错的视觉效果，相关系数也符合数字水印质量指标的要求。
 
 关键词：图像水印，离散余弦变换，人眼视觉系统
  
 
Design and Implement of Digital Image Watermark Based on DCT
                                              
Abstract
 Nowadays, disputes of digital entries caused by piracy and copyright have become an increasingly serious social problem, so digital watermarking has been the effective measures to protect digital copyright and maintain security, and it has been applied into ownership Watermark Search, Copy control, fingerprint identification and other aspects.
 Image Watermarking against the program in recent years is the main research direction. This paper focuses on a DCT-based image digital watermark design and implementation. Chapter I provides a digital watermark current status of research and simple description of the idea and expected target of achieve image digital watermarking system; The second chapter describes the knowledge and technology the paper mainly related; The third chapter discusses optioning MATLAB as a tool to achieve the purpose and advantages and the environment of the system configuration; Chapter IV of the main thesis of this part is the specific process of the system implementation, including major steps, watermark embedding, watermark extraction, watermark detection. From the experimental results, the system can ensure that the watermark is not visible, and maintain better robustness, Even in the attack are still good visual effects, and the correlation coefficient is also in line with digital watermarking quality objectives.
 
Key Words: Digital Watermark , Discrete Cosine Transformation(DCT),  Human Visual System (HVS)

目        录
1  绪论 1
1.1 国内外研究状况 1
1.2 系统目标分析 4
1.3 系统设计构想 4
2  系统关键技术介绍 5
2.1 数字水印 5
2.1.1  数字水印的基本框架 6
2.1.2  数字水印的特点 7
2.1.3  数字水印的分类 8
2.2 离散余弦变换 9
2.3 人眼视觉感知系统 10
3  系统环境配置及工具选择 13
3.1 开发工具的介绍与选择 13
3.1.1  MATLAB 13
3.1.2  C/C++ 14
3.1.3  关于图像水印 15
3.2 工作环境的配置 15
4 系统实现 16
4.1 水印嵌入 16
4.1.1  水印嵌入思路分析 16
4.1.2  水印嵌入步骤 16
4.2 水印提取 18
4.2.1  水印提取思路分析 18
4.2.2  水印提取步骤 18
4.3 水印测试 19
4.3.1  白噪声攻击测试 20
4.3.2  JPEG压缩攻击测试 21
4.3.3  高斯低通滤波攻击测试 22
4.4 本章小结 23
5 总结 24
致谢 25
参考文献 26