基于统计分析的数字水印检测技术研究

【作者】 张健；

【导师】 孙兴华；

【作者基本信息】 南京理工大学 ， 计算机软件与理论， 2007， 硕士

【摘要】 随着数字技术和网络技术的不断发展，如何解决相关的版权保护、完整性认证、秘密通信等问题，成为亟待解决的研究课题。信息隐藏就是为解决这些问题而出现的。数字水印技术起源于信息隐藏技术的，为实现有效的知识产权保护提供了一条崭新的思路，近年来已成为多媒体信息安全研究领域的一个热点问题。信息隐藏的嵌入和攻击与传统密码学类似，必然经历的加密-解密的否定之否定的螺旋提高过程。这就意味着对检测技术进行研究，能更深入了解和发现现有隐藏技术的弱点，进而促进隐藏技术的发展。对现有的一些典型的数字水印算法的分析，对于水印检测技术的研究起到了促进作用。本文重点阐述了数字图像信息检测处理的思想，介绍了相关的背景和工作。改进了一个信息隐藏的检测模型，基本实现了对变换域信息隐藏的检测，对数字图像的变换域上DCT隐藏以及DWT隐藏的数字水印进行检测，并对检测的结果进行了讨论，实验结果表明了本文算法具有一定的鲁棒性。此外，还从安全的角度对数字水印检测后的相关处理工作进行了介绍，主要阐述了不同类型、不同强度噪声的添加对图像中数字水印的影响。同时介绍了一些主要的攻击水印的方式。更多还原

【Abstract】 With the development of digital technology and networking technology, Solving thecorrelative problems, such as copyright protection, intergrality authentication, privacycommunication and etc,, is becoming more and more urgent. Information hiding can solvethese problems. Digital watermarking, which originates from steganography, provides anovel way for the protection of intellectual property rights, and becomes a hot spot in theresearch field of multimedia data security in recent years.We first describe the basic concepts of Steganography and digital watermarking, andintroduce some basic concepts of digital image watermarking. Then we expound thedefinition, background, classification and requirements about digital watermarking . Wepropose a general framework of digital watermarking system. Then, we analyze the state ofart of digital watermarking algorithms. Following this, we give a discussion about therobustness of watermarks, i.e., attack analysis. We still discuss some possible researchdirections. Finally, we outline the thesis.We present the idea of Stegnalysis of digital image watermarking. We first introducethe background of Stegnalysis and some related work. By constructing a algorithms ofStegnalysis, all kinds of image frequency-domain watermarking can be detected. Thealgorithms described in the following chapters are all based on this parameterizationalgorithm. We introduce the background and related work about DCT-based andDWT-based digital watermarking technology. Then we apply the algorithms in Chapter 2to detect the Steganography of digital image watermarking. The experimental results showthat the algorithm is effective and robust.We also present the related work to do with the digital image watermarking afterStegnalysis. We introduce the change of watermarking by noise added to the digital image.更多还原