基于Patchwork算法的数字水印嵌入技术

本科学生毕业论文

论文题目：学 院：年 级：专 业：姓 名：学 号：指导教师： 基于Patchwork算法的数字水印嵌入技

术

电子工程学院 2008级

电子信息科学与技术 贾仁旭 20086600 王晓飞

2012年4月30日

摘要

当今社会随着数字媒体信息使用的增长,使得人们可以快捷方便地获得数字信息和在线服务。但同时，盗版也变得更加容易，对数字内容的管理和保护成为迫切需要解决的问题。

本文介绍了数字水印技术的发展情况及数字水印的研究的重要性，对数字水印的应用及算法做了简单的介绍。着重介绍了数字水印Patchwork 算法，并且利用Matlab编程实现了这一算法。通过实验验证了嵌入水印后的图像和原始图像几乎毫无差别，说明水印达到了很好的隐藏效果，充分证实了数字水印的不可感知性。

关键词

信息隐藏；数字水印；空域图像水印技术；Patchwork

I

Abstract

Today's society the use of digital media is growing rapidly, making it quick and easy access to digital information and online services. But at the same time, piracy has become easier, the digital content management and protection of the urgent need to address the problem.

This article describes the development of digital watermarking technology and the importance of the study of digital watermarking, digital watermarking applications and algorithms to do a brief introduction. Focuses on digital watermarking Patchwork algorithm, and the use of Matlab programming algorithm. Verified by experiments almost no difference in the watermarked image and original image, a watermark to reach the hidden, fully confirmed by digital watermark imperceptibility.

Key words

Information hiding; digital watermark; airspace image watermarking technology; Patchwork

II

目录

摘要 ............................................................................................................................................ I Abstract ................................................................................................................................... II 第一章 绪论 ............................................................................................................................. 1

1.1 引言 ............................................................................................................................ 1 1.2 数字水印研究的重要意义 ........................................................................................ 1 1.3 本课题的主要研究内容及章节安排 ........................................................................ 2 第二章 数字水印技术 ............................................................................................................. 3

2.1 数字水印技术介绍 .................................................................................................... 3

2.1.1数字水印的基本框架 ...................................................................................... 3 2.1.2 数字水印系统的分类及特性 ......................................................................... 8 2.1.3 数字水印的主要应用领域 ............................................................................. 9 2.2 数字图像水印技术 .................................................................................................. 10

2.2.1 空域图像水印技术 ....................................................................................... 10 2.2.2 DCT域图像水印技术 .................................................................................. 11 2.2.3 小波域图像水印技术 ................................................................................... 12 2.3 数字水印的应用实例 .............................................................................................. 13

2.3.1 数字签名 ....................................................................................................... 13 2.3.2 在电子印章中的应用 ................................................................................... 14 2.3.3 指纹身份认证水印 ....................................................................................... 14

第三章 Patchwork数字水印 ................................................................................................. 16

3.1 Patchwork算法的概述 ............................................................................................ 16 3.2 Patchwork算法方法描述 ........................................................................................ 16 第四章 程序设计 ................................................................................................................... 18

4.1 算法的伪C代码描述 ............................................................................................. 18 4.2 试验程序 .................................................................................................................. 20 结论 ......................................................................................................................................... 23 参考文献 ................................................................................................................................. 24

致谢 ......................................................................................................................................... 25