Research On Copyright Protection Using Still Image Digital Watermarking

Digital watermarking has been a rising network information security technology. It is a multimedia technique recently developed with the purpose of enhancing copyright protection on multimedia files. And it hold wide application prospect in several domains, for example copyright protection, information confirmation and etc. With the rapid development in recent years, the digital image watermarking is becoming a popular topic of the network security. The objective of this thesis is to develop reliable and secure structures for digital watermarking technology. Towards this goal, basic theoretical research and applied basic research of the copyright protection using digital watermarking were taken in the thesis. Digital watermarking technology was first introduced synoptically. The algorithm model, basic characters and general principle were summarized. Some attacks means and the existing image watermarking algorithms were generalized. And then two improved digital watermarking algorithm based on HVS and wavelet transform respectively were put forward. The above two algorithms both show robust and dependability. At the end of the thesis, it builds up an instance of the application of digital watermarking, which widens the idea of the study of watermarking. The thesis also supplies a system to prove the algorithm that referred in the thesis.