Design And Research Of Text Watermarking Based On Interpunctions

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.