【作者】 谢君；

【导师】 李学斌；

【作者基本信息】 北京化工大学 ， 计算机应用技术， 2008， 硕士

【摘要】 随着因特网的迅猛发展和多媒体技术的广泛应用,越来越多的数字作品通过网路的形式传输、发表,使得这些作品的版权保护技术显得尤为重要。数字水印是一种有效的数字产品版权保护技术。对数字水印的研究目前主要集中在以图像、声音等载体来进行信息的隐藏,以文本为载体的水印技术方面的研究成果较少。而事实上,人们的很多创意都以文本的方式储存和传输,文本作为信息传递的一种手段,其应用大大地超过了图像、视频和音频的范围。同时随着高性能打印机和扫描仪的不断出现,对于印刷出版物的制假、造假、盗版等行为日益猖獗,而传统的印刷品防伪技术又存在着高成本、技术复杂、应用面窄等缺点,假冒伪劣产品严重侵害了图书出版作者的利益。与其他印刷品防伪技术相比,将数字水印技术应用于图书等印刷出版物防伪方面成本低、实现简单,是一项对传统印刷品防伪技术的发展和改进。本文针对传统文本水印方法存在的不足和中文汉字本身的复杂度,提出了一种新的基于文本中的标点符号的水印算法。该方法基于对中文文档中的标点符号的分析和比较,在不影响文本字体格式和内容的情况下,利用人类视觉过程对标点符号的形状不敏感、阅读文章时不会把视线过多地停留在标点符号上的特点,将相关的版权信息嵌入到文本之中,并利用密码学中的多表代换方式和信息处理中的纠错编码,对水印信息进行预处理,实现了对水印信息的加密和保护。为了说明本文所提出方法的可行性,本文选取了以Windows XP操作系统为工作平台,基于Visual C++/MFC和MATLAB7.0环境对文本数字水印算法做了仿真实验。结果表明,本文所提出的文本水印的研究成果突破了现有的水印方法,尤其是对中文文本嵌入水印的难题进行了有益的尝试,对于图书等印刷品领域的版权保护的研究和发展有着重要意义。更多还原

【Abstract】 With the rapid developing of Internet and the wide using of multimedia technique,more and more digital products have been conveyed and published through the net.It is urgent to protect the copyright of these products.Digital Watermarking is an effective technology for copyright protection in recent years.Currently,Watermarking researchs are mostly focused on image and audio for hiding information.Meanwhile,the researchs of text as a cover-object are relatively fewer.But in fact,lots of people’s originality can be saved and transfered by the way of text.As an important way of information transferring,the application of text exceeds consumedly image,video,audio,etc.With the inventing of the high performance printer and scanner,faking and pirating on the presswork publication are rampant.And the traditional techniques of the presswork publication have some shortcomings,such as high cost, complex techniques,and small cover.Therefore,the benefits of the authors have been strictly losed by faking and pirating pressworks.Compared to the other techniques,it is a significative try and development to combine the digital watermarking with the protection of publication because of its lower cost and simply implement.Based on analysis of disadvantages of the present algorithms and the complexity of the Chinese text,this paper presents a new text-watermarking using the interpunctions as cover-object in the text.Meanwhile,according to the similarity on interpunctions in different modes and low sensitivity of the human’s visual systems,when the readers take a look of the articles,they don’t pay much attention on the interpunctions.Using these characteristics, the informations which are protected can be embedded into the text.Before embedding the informations,we use the algorithms in cryptology and the different encoding methods in communication-progress as a pre-progress, which can make full use of the watermarking informations and protect them.In order to show the feasibility of the text-watermarking algorithm presented by this paper,a text-watermarking program based on the Windows XP is designed and developed using Visual C++、MFC and MATLAB 7.0. The experimental results can prove that this mothed break through the traditional text-watermarking,especially for the Chinese text and this algorithm has an important signification for researches and developments for the publication.更多还原