文档介绍：混沌在数字图像水印系统中的应用研究
摘要
数字通信、网络以及计算机技术的不断发展和日趋成熟,促进了多媒体技术的迅速普及和应用,但随之也带来了一系列的问题,多媒体版权的保护问题已经成为目前讨论的热点问题之一。数字水印技术就是在这种环境下应运而生的。该技术是通过在原始数据中嵌入秘密信息——水印(watermark)来证实该数据的所有权或者用于未经授权的篡改验证。它主要通过在媒体信息中嵌入标记信号(数字水印),为多媒体信息在防伪、防篡改、认证、保障数据安全和完整性等方面提供有效的技术手段。近年来,人们开始寻求多媒体信息保护的新方法。这其中,基于混沌的数字水印技术显示出了其独到的优势,有可能成为新的多媒体保护的有效手段。
本文围绕混沌的优良特性及其在数字水印技术中的应用展开研究,主要内容包括混沌的基本概念,特性和混沌在数字图像水印中的应用。本文给出了一种基于混沌的图像数字水印算法,利用混沌系统产生的混沌信号作为数字水印信息,并在DCT变换域中有选择地嵌入水印,再经DCT逆变换得到水印图像。数值实验结果表明,该算法具有较强的透明性和鲁棒性,水印检测结果准确,对给定的几种图像处理攻击有抵抗性。由于混沌信号具有似噪声、宽频谱等特性,因此引入混沌信号,使得水印产品的安全性得到进一步提高。
关键词:数字水印,混沌系统,DCT
Chaos in the application of digital image watermarking system
ABSTRACT
With the fast development of munication, network puter technology, multimedia application es popular. However, it also brings some problems, such as pirate, illegal copy etc. Copyright protection has e a key problem for digital watermarking technique emerges with the tide of the times under this kind of environment. The technique announces the copyright or detects the tamper by embedding the secret information一watermark into the original can provide efective protection for digital media forgery,falsification, authentication, security and intactness by embedding a special mark(digital watermarking) into multimedia data. In recent years, people began to seek new ways of multimedia information protection. Among them, the digital watermarking technique based on chaotic showed its unique advantages, likely to e the new multimedia protect effective means.
This paper focus on its excellent characteristics of chaos in the application of digital watermarking technology launched research, main content includes the basic concept of chaos, properties and chaos in the application of digital image paper gives a kind of digital image watermarking algorithm bases on chaos, using the chaos system to produce a chaotic signal as digital watermarking information, and in the DCT transform domain watermark selectively,