【作者】 孙亚伟；

【导师】 宋国森；

【作者基本信息】 燕山大学 ， 电路与系统， 2004， 硕士

【摘要】 随着通信、计算机和Internet技术的飞速发展，在许多方面改变了人们的生活。基于计算机和网络的多媒体信息交换为数字产品的使用、传播提供了便利的途径，使数字作品与传统作品相比有了很大的优越性，由此而引出的多媒体信息安全问题成为国际上研究的热门课题。数字水印技术是一门新兴的信息隐藏技术，通过在原始数据中嵌入大量的秘密信息——水印(Watermarking)来证实该数据的所有权或完整性，并能够承受一定的攻击行为，以此来抵制对数字作品的盗版或篡改。本文的主要工作就是进行数字水印技术的研究，内容有以下二个方面：(1)对数字水印技术及其相关的小波分析、混沌理论等基本概念、理论、知识点等进行了概述；对数字水印技术的发展、现状及未来展望做了综述性介绍，明确了本文的研究方向。(2)提出了基于小波和混沌的非盲数字水印算法和盲水印算法。这两种算法都选用了有意义的二值图像作为水印，采用本文提出的基于混沌序列的置乱方法对水印进行处理；在水印嵌入域上，选择了具有与人眼视觉特性十分符合的离散小波变换，并考虑了小波系数的容噪能力；在嵌入方法上采用了同一水印多重嵌入技术；在水印检测时，采用了具有一定纠错能力的水印提取方法，提高了水印检测的正确率。在盲水印算法中，本文提出了具体的嵌入方法，由小波系数容噪能力来决定参考值的方法，加大了水印嵌入的灵活性，同时，参考值也可作为一个密钥，对水印的安全起一定的保护作用。更多还原

【Abstract】 With the development of communication, computer and Internet technology, humans’ lives have been changed a lot. Based on the technology of computer and network, the multimedia information exchanges provide a convenient way for using and spreading of digital produces. This make digital produces have more advantages then traditional produces. At the same time, multimedia information security problems became a pop international research question. The digital watermarking technology as a new information hiding technology, can prove the original data copyright and integrity through embedding a mass of cryptic information-watermarking in it, because watermarking can endure some attack actions, such as pirate and modification. In this dissertation, the main work is the research of digital watering technology. The contents have two parts as shown:(1) The summarizations of basic concepts, theories and main knowledge for the digital watermarking technology, wavelet analyze and chaos theory. With the introductions of the digital watermarking technology development, status and expectation, the research aspect of this dissertation has been proposed.(2) In this dissertation, proposed a non blind watermarking algorithm and a blind watermarking algorithm based on wavelet and chaos. In those algorithms, selected two value image with exact meaning as watermarking and used the method that proposed in this dissertation based on chaos sequence to mess it; Selected digital wavelet transform which has human visual system characteristic as the watermarking embedding domain, and considered the noise acceptable capability of wavelet coefficients; Used the same watermarking repetitious embedding technology as the watermarking embedding means; Used a method with rectify ability to enhance the exactness rate when do watermarking detection. In blind algorithm, the material watermarking embedding way has been provided, Using the noise acceptable capability of wavelet coefficients to confirm the reference value improved the watermarking embedding agility. At the same time, the reference value can be the secret key to protect the watermarking’s security.更多还原