摘要近年来，计算机及网络技术得到快速发展，数字作品的传播和拷贝变得越来越方便，同时使得数字作品的信息安全保护和版权保护也成为迫切需要解决的实际问题。数字水印技术是近年来在信息安全领域兴起的保护知识产权的一种新技术。它通过在原始数据中嵌入一些可鉴别的重要信息为受到版权保护的媒体数据的完整性和所有权归属提供完全和可靠的证据，以此达到防止数字产品的盗版和篡改目的。本文提出了一种基于分数阶Fourier域的二值图像水印算法,主要做了如下工作：
(1)在嵌入水印之前先对水印信息利用Arnold变换进行置乱，以此来提高水印的安全性。
(2)为了提高传统相关性检测方法的准确率，在嵌入水印时采用嵌入两个不相关伪随机序列的方法，大大提高了检测的准确率。
(3)采用DCT变换将图像的大部分能量集中在低频部分，有利于水印的嵌入。
(4)本文水印的检测方法为盲检测，不需要原始水印信息的参与，所以具有重要的现实意义。27630
关键词 分数阶傅里叶变换 数字水印 鲁棒性 不可见性 图像置乱
毕业论文设计说明书外文摘要
Title The research of digital watermarking based on the fractional Fourier Transform
Abstract
In recent years, the computer and the network technology is developing rapidly, the spread of digital works and copy becomes more and more convenient, at the same time, the information security protection of digital works and copyright protection has become an urgent problem. Digital watermarking is a new technology in the protection of intellectual property rights the rise in recent years in the field of information security. It can be identified by embedding some important information to provide complete and reliable evidence for the media data is protected by copyright and integrity of the ownership of the original data, in order to prevent the piracy of digital products and tampering with the purpose of. This paper presents a two value image watermarking algorithm based on fractional Fourier domain, mainly do the following work:
(1) Before watermark embedding the watermark information using the first Arnold transform scrambling, in order to improve the security of watermark.
(2) In order to improve the accuracy of traditional correlation detection method, embedding two are not related to the pseudo-random sequence method is adopted in the embedded watermark, greatly improve the detection accuracy
(3) By using DCT transform the most of the energy of image concentrates on the low frequency part, is conducive to the watermark embedding.
(4) This watermark detection method for the blind detection, does not need the originalwatermark information is involved, so it has important practical significance.
Key words Fractional Fourier Transform (FRFT) Digital watermarking
Robustness Invisibility Image scrambling
目 录
1绪论1
1.1 课题背景及意义1
1.2 数字水印技术的应用领域 1
1.3 数字水印的研究现状 3
1.4 论文的结构及主要工作4
2 数字水印 6
2.1 数字水印的定义及性能要求 6
2.1.1 数字水印的定义 6
2.1.2 数字水印的性能要求6
2.2 数字水印的工作原理 7
2.2.1 数字水印的生成 7
2.2.2 数字水印的嵌入 7
2.2.3 数字水印的检测与提取 8
2.3 常见攻击及其应对策略9
2.4 本章小结 10
3分数阶Fourier变换的基本理论11
3.1 一文分数阶Fourier变换11
3.1.1 一文分数阶Fourier变换的定义 11
3.1.2 一文分数阶Fourier变换的一些性质13
3.2二文分数阶Fourier变换 14
3.2.1二文分数阶Fourier变换的定义 14
3.2.2二文分数阶Fourier变换的一些性质 14 基于分数阶傅里叶变换的数字水印研究:http://www.751com.cn/tongxin/lunwen_22156.html