DCT图像数字水印技术研究MATLAB

摘要随着计算机网络技术的飞速发展和多媒体信息体系的日趋完善，数字水印技术引起了学术界的广泛注意并掀起了研究高潮。本文系统性地介绍了数字水印技术的基本原理和应用方法，并主要研究了一种基于离散余弦变换（DCT）的图像数字水印算法，且使用了MATLAB软件来实现这一算法。本文的算法达到了对图像数字水印的嵌入与提取的功能，并通过加噪、滤波、压缩、简单的几何攻击等来验证其鲁棒性。作为衡量数字水印效果的重要指标之一，鲁棒性反映了水印算法抵抗各种攻击的能力。本文通过水印攻击实验证明了离散余弦变换算法具有较好的性能，证明了水印具有不可见性和较好的鲁棒性。80408

毕业论文关键词离散余弦变换图像水印 MATLAB 鲁棒性

毕业设计说明书外文摘要

Title Research on Image Digital Watermarking Technology

Abstract With the rapid development of the computer network technology and the improvement of the multimedia information system, digital watermarking technology has attracted the attention of the academic community and set off the climax of the research。 The basic principles and application of methods of digital watermarking technology are systematically introduced in this paper, and image watermarking algorithm which based on discrete cosine transform (DCT) is mainly researched on, then the algorithm is realized by MATLAB software。 The algorithm of this paper achieves the function of embedding and extracting of image digital watermark, and verifies its robustness by adding noise, filtering, compression and simple geometric attacks。 As one of the important indicators to measure the effects of digital watermarking, the robustness of the watermarking algorithm is a reflection of the ability to resist various attacks。 In this paper, the discrete cosine transform algorithm is proved to have better performance, and the watermark is invisible and robust。

Keywords DCT image watermarking MATLAB robust

1 引言 1

1。1 本课题的研究背景及意义 1

1。2 国内外数字水印的研究概况 1

1。3 本文的主要工作 3

2 数字水印技术的理论基础 4

2。1 数字水印基本框架 4

2。2 数字水印的基本特征和分类 6

2。3 数字水印的常用算法 8

2。4 数字水印的攻击方法 10

2。5 数字水印系统的性能评价 12

3 基于DCT的图像数字水印算法 15

3。1 离散余弦变换简介 15

3。2 离散余弦变换发展 15

3。3 离散余弦变换定义 16

3。4 离散余弦变换特点 16

4 DCT算法的MATLAB实现 18

4。1 MATLAB简介 18

4。2 MATLAB在图像水印研究中的特色 18

4。3 常用于图像数字水印的MATLAB函数 18

4。4 DCT的MATLAB实现 DCT图像数字水印技术研究MATLAB:http://www.youerw.com/zidonghua/lunwen_93396.html