基于离散小波变换的水印算法.doc

本科生毕业论文


题目基于离散小波变换的
水印算法
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基于离散小波变换的水印算法
栗志强
摘要
随着因特网的日益普及和多媒体技术的发展,图像、图形、音频、视频等数字媒体已经成为信息交流的一种重要方式。因特网上信息的获取达到了前所没有的深度和广度,但对多媒体作品的侵权也变得更容易,非法复制、篡改也更加方便,极大的损害了作者及版权所有者的利益。如何有效的保护多媒体信息的版权成为信息安全领域的一个热门话题。作为信息隐藏在计算机多媒体领域的一个重要应用,数字水印技术使得人们能够在多媒体信息中嵌入不可见的信息。数字水印技术为多媒体版权保护提供了一个崭新的方法,近年来在国际上引起了人们极大的兴趣和注意,得到了广泛的研究和应用。
本文比较系统地研究了水印在静止图像中的应用问题,首先介绍了数字水印技术及其原理、特点、以及目前的应用状况等。然后对数字水印算法模型、分类以及典型算法进行了简要的分析。在此基础上,提出了一种基于小波水印算法,实验结果表明本算法简单并在常见的剪切、压缩、噪声等攻击下都能提取出水印信号,具有较高的鲁棒性。
关键字:数字水印;水印算法;离散小波变换;图像置乱;鲁棒性
Research on image watermarking algorithm
on discrete wavelet domain
LI zhi-qiang
Abstract
With the popularization of and the development of multimedia technique, digital multimedia has e main means of munication. While one can acquire a wide range of multimedia data through the , various problems arises naturally that seriously harm the benefit of the author or the copyright owner. How to protect multimedia data from violation has e an important issue in information security field. As a main application of information hiding technique to multimedia copyright protection, the digital watermarking technique, which embeds an invisible signal (watermark) to original multimedia data, has been proposed as a viable solution for the copyright protection and authentication of multimedia data in worked environment since it makes it possible to identify the author ,owner, distributor or authorized consumer of multimedia data. So it has drawn extensive attention in recent years and has been widely applied.
In this paper, the author first makes an overall review on the digital watermarking techniques, including the definition, characteristics, and main application domains of digital watermarking. Then the author analyzes fundamental principles of digital watermarking algorithm in detail such as the general framework, classification, and the typical algorithm. Finally, anew image watermarking scheme is proposed by incorporating the Wavelet