Theory On Image-Based Digital Watermarking And Application Technology

Digital technologies provides facilitate for digital information processing, reproduce, transmit and sales, and brings the possibility of duplication and tampering with illegal. At present, digital watermarking technology has been seen to be a means with great potential to resolve this problem. Digital watermarking technology is applied to the copyright protection, data authentication, data hiding and other fields.This paper mainly researches and studies the theory of digital watermarking and copyright protection technology in-depth, sums up the history of digital watermarking technology, introduces the classification, application and the status quo of the watermarking technology, describes watermark embedding and detection principle, analyzes of the basic characteristics in the practical application and the design requirements and evaluation methods. This paper presents a series of new algorithms and application models which solves a number of theoretical and practical aspects.The main results can be summarized as follows:1. It research the second-generation digital watermarking based on the discrete wavelet transform (DWT) domain, presented and designed watermarking algorithm (LWL) which can take full advantage of the characteristics information of image, select a more appropriate measure factor to control the strength and energy of the watermark embedding, moreover, to effectively resist Geometric attacks and Stirmark attacks.2. On the basis of analysis and comparison of existing JPEG compression algorithm model and the watermarking algorithm (LZL), it presents the JPEG watermarking algorithm of decomposition technology. The algorithm will join watermarking technology and JPEG compression technology. According to the different types of watermarks information, firstly,it shifts different types of watermark information into a unified binary sequence watermark information flow, and then embedded watermark in the process of JPEG compression, so that algorithms can be applied to various watermarking information.3 . Considering of the many advantages DT-CWT, an improved digital watermarking algorithm (LCL) based on the DT-CWT domain is presented, which fully integrated the human visual system (HVS) of the mask, embedded the watermark into low-frequency coefficients of the complex wavelet domain. It improves the watermark performance, makes the algorithm choose between interference and visibility.4. By integrating digital rights management and watermarking principle, it proposed a digital rights management model (WDP) based on watermarking technology, which has three functions: first, to provide enquiries, the purchase and use of digital content, test publishers and copyright content services for user; second , to provide transactions, track and verify of the contents copyright services for the distributors; third, to provide copyright registration, copyright issuing and copyright disputes service for the owner of copyright. Analysis shows that the model is reasonable and secure5. According to principle of cryptography, digital watermarking technology and authentication technology, it developed a digital copyright protection software prototype system, and realized digital TV programming copyright protection system for digital TV set-top boxes. The results show that this system can effectively control the illegal transmission of digital TV content, approve the digital media content copyright protection.