## DWT-SVD基于小波变换的数字水印技术研究

Technology Research of Digital Watermarking Based on Wavelet Transform
Abstract：With the development of the era, digital watermarking plays more and more important roles in the copyright protection of audio and video.At present, large number of digital watermarking algorithms have been proposed,and wavelet transform is one of the important algorithms. One of the reasons is that watermarking algorithm of high-frequent-domain image can take advantage of Human Visual System (HVS) to improve the performance of the watermark. However, when meeting a variety of common attack, Discrete Wavelet Transform(DWT) algorithm has some shortage.Therefore, researchers combine Discrete Wavelet Transform and Singular Value Decomposition (SVD) .The new algorithm not only preserves DWT itself advantages,but also can use SVD to improve the robustness of the algorithm.

Firstly,this paper makes a comprehensive introduction about digital watermarking,including principles,the current development status and the application of various aspects.Secondly, assisted by formula,the article introduces DWT and DWT-SVD algorithms of watermark embedding, extraction and detection proces.Lastly, in practice with the MATLAB platform, we make two algorithms suffer all kinds of geometric attacks, in the form of pictures and tables to show the advantages and disadvantages of two algorithms.
Keywords：wavelet transform  the digital watermark  DWT-SVD  DWT  robustness

1 绪论    1
1.1研究背景    1
1.2研究现状    1
1.3研究的理论意义    2
1. 4数字水印算法的分类    2
1.5本文的主要内容    3
2 数字水印技术的原理    4
2.1数字水印的概念    4
2.2数字水印的特点    4
2.3数字水印技术的基本原理    4
2.4数字水印技术的划分    6
2.5数字水印技术的应用    6
3 基于离散小波变换的数字水印算法    8
3.1小波变换的发展历史    8
3.2小波变换的定义    8
3.3离散小波变换    10
3.4基于小波变换的数字水印的基本流程    10
4基于DWT-SVD算法的数字水印算法分析    14
4.1奇异值分解    14
4.2水印的嵌入    15 DWT-SVD基于小波变换的数字水印技术研究:http://www.lwfree.cn/wuli/20190505/33064.html
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