Database Watermarking Technology Research And Multimedia Watermarking System Implementation

With the rapid development of computer and network technology, the digitization ofinformation provides a great convenience to the applications, but the concomitant emergence ofdigital content security issue has been hampering seriously the development of digitalinformation. Digital watermarking technology as an effective means of copyright protection hascaused widespread concern and gotten a rapid development in recent years. This paper designsand implements the multimedia digital watermarking system based on the research ofhigh-robust Chinese character attribute domain database watermarking algorithm.Firstly, this article gives a comprehensive and systematic exposition about domestic andforeign researches in the field of database watermarking, introduces the basic features,performance evaluation and classification of digital watermarking. On this basis, the paperanalyzes the application framework and the basic characteristics of the database watermarkingin-depth.Secondly, this paper analyzes the database non-numerical attribute domain digitalwatermarking features and the structure characteristics of Chinese characters, combining withthese characteristics designs digital watermarking algorithm for Chinese character attributes. Inorder to balance the robustness and visibility proposes the safety factor to constraint watermarkpretreatment process. This algorithm is described in detail from the pretreatment, embedding,detection and extraction of watermark, analyzed from the security. The experimental resultshows that the algorithm under the case of ensuring the watermark imperceptibility andunaffecting the normal database uses has good robustness in resistance to the common assaultslike the subset and out of order attack, and also can achieve the blind extraction of watermark.In the end, this paper designs a complete B/S structure cluster version multimedia digitalwatermarking system. The algorithm of the system references the method of calculating thesafety factor in the database digital watermarking algorithm. Through the multimediawatermark system can intuitively and batch product and process the watermark tasks and viewthe watermark contrast effect. Ultimately, the test results show that the design of multimediadigital watermarking system can achieve embedding, detecting and extracting watermarkrapidly, the system has reached the design goals from functionality and performance.