文档介绍：基于小波变换的静态图像数字水印技术的研究
摘要
随着计算机技术和网络应用的迅速发展,数字媒体的复制、加工及传播变得非常方便。这些信息交流带给人们视觉和听觉享受的同时,传统的版权保护手段和数据安全技术面临着极大的挑战。数字水印技术就是在这样的背景下发展起来的,近年来已经引起了极大的关注。
本文主要针对基于小波变换的静态图像数字水印技术展开研究。近年来,随着小波理论的不断发展完善,小波分析已经被应用到各个学科领域。同样,小波在数字水印方面也得到了广泛的应用,并且产生了多种关于数字水印的算法。本文首先探讨了数字水印研究的目的及意义,总结分析了国内外研究现状。对数字水印技术的基本概念,分类,基本框架,实际应用等方面进行了概述。在此基础上,对基于小波变换的数字水印技术展开进一步的研究,分析了其相对于其他算法的优点,特性等方面的内容。其次阐述了小波分析理论基础,图像置乱技术及其应用,对小波域数字水印算法作了细致的研究。最后通过Matlab仿真实现,对基于小波变换的数字水印技术做出客观的性能评价。性能测试主要是选取不同的攻击方式、强度对水印图像进行攻击,然后通过峰值信噪比(PSNR)和相似度(NC)两个值来评价其性能。实验表明基于小波变换的数字水印技术有着良好的鲁棒性和不可见性。
关键词:数字水印,小波变换,图像置乱,嵌入算法,提取算法
Research on Technology of Static Image Digital Watermarking Based-on Wavelet Transform
ABSTRACT
With puter technology and the rapid development work technology, digital media copying, processing and transmission became very convenient. These exchanges of information to bring people visual and auditory enjoyment, while the traditional copyright protection means and data security technology faces great challenges. Digital watermarking technology is developed in this context and has caused great concern in recent years.
This paper mainly based on wavelet transform on the digital watermarking technique of static image. In recent years, with the continuous development and improvement of wavelet theory, wavelet analysis has been applied to various subject areas. Similarly, the wavelet in the digital watermarking has also been widely used, and produces a variety of digital watermarking algorithms. This paper firstly probes the digital watermarking the purpose of the research and significance, summarizes and analyzes the domestic and foreign research status quo. And on the basic concept of digital watermarking technology, classification, the basic framework, practical applications are summarized. On this basis, based on discrete wavelet transform to the digital watermarking technique conduct further research, analyzes its relative to other algorithm, characteristics such as the advantages of the content.