Design And Application Of Multi - Functional Blind Watermarking System Based On

To the store method of the traditional paper archives not only the space was occupied, but also its content is easy to be damage, with the development of information technology and Internet technology, the archives information service also gradually began to enter into the information age.Many archives produces a lot of digital files,but the digital archives is more likely to be spread and shared, which may lead to copyright disputes. Digital watermark technology is the one that can achieve copyright protection, authentication and identification and so on, which can effectively guarantee the security and integrity of the image. Digital watermark technology become a research focus in the digital works copyright protection. But traditional single watermarking is only robustness or fragile. The design based on Multi-Function blind watermarking can not only meet the requirements of the above, but also using FPGA parallel design can also enhance the algorithm speed and application value.A method of multi-functional blind watermarking was studied by the paper. At first,the watermark embedding is that Image pixels through DCT transformation to the frequency domain, and then select the lowest five bits of the low frequency coefficient as robust watermark carrier, and then return to the spatial domain.Meanwhile,using Least Significant Bit algorithm on spatial domain to fragile watermark can be embedded into the least significant bit plane. And the watermark extraction by using blind extraction.The system is implemented on FPGA development platform. The realization way is the way of combination of hardware and software. The processing of embedding watermark and extracting watermark just need a processor about watermark,it without involving personal computer. The high complexity or the algorithm of large amount of computation such as DCT2, IDCT2 using the hardware design, other algorithm such as the control module uses software design. In this paper, at first, introduced and necessary explanation to the system design of the algorithm on the system architecture design, and then to the development of SOPC system are further discussion. Finally, download complete system design into the FPGA board. The experimental results verify the feasibility of watermarking system, meeting the system design requirements. In addition, in order to study the application of multi function digital watermarking in copyright protection, in this paper, the fifth chapter will discuss a kind of image achieve the application of copyright protection scheme about digital archives.