Algorithm Of Text Watermarking Based On Method Of Characters Coding Of Words Platform And Technology Of Improven Morphosyntactic Alterations

With the development of information technologies, the acquirement, storage and application means of information have changed greatly. Those changes bring us so many conveniences. But people can copy and tamper digital products more easily without permission of their copyright owners. Under this condition, the digital watermarking technology, as a new approach which is applied to protect security of multimedia products, comes into being. In this paper, the classify, performance standard and existing problems of text watermarking algorithm have been studied. A novel watermarking algorithm is presented, which is applied to Chinese characters coding method. And the watermarking algorithm based on morphosyntactic alterations of natural language technology was improved.Firstly, this paper gives the frame of digital watermarking system and performance standard of watermarking algorithm. It also analyses the problems which are the poor of capacity and robustness.Secondly, aiming at text watermarking algorithm based on document structure, watermarking algorithm[0] based on Chinese character encoding method in words platform is given. The algorithm applies zero-watermarking technology and combines with Chinese characters encoding rules. It makes use of words platform character encoding rules to get the text word vector encoding. The embedding and extraction of algorithm is by of detaching-words, expanding-words, formation coding, backformation coding and unmatched coding.Finally, in watermarking based on natural language text, this paper focuses on analyzing natural language watermarking via morphosyntactic alterations. Automatic selection and screening mechanism is made use of to increase watermark capacity; and improving the invisibility of text vector with air watermark to enhance the robustness. Aspect of watermark capacity and robustness, natural language watermarking via morphosyntactic alterations and the improving of this algorithm are analyzed and compared through theoretical analysis and simulation.