Research Of Digital Watermarking Algorithm Based On HVS And DCT

With the rapid development of computer and network,the daily life and work of human beings are becoming digitalized and networked. A large number of private data are transformed in the Internet,and electrical commerce is more and more popular. All these challenge the traditional method of copyright protection and technology of data security. In this background,digital watermarking is developed gradually and become an effective protection technique,Which embeds a copyright information into multimedia products in order to authenticate the ownership or transmit to the available information. Based on the research achievements of many scholars,regarding the situation of nowadays digital watermarking,the main innovative work of this dissertation is as follows:1. Investigated the basic principle and characteristic of digital watermarking technique,their research background, application areas,recent development and the future of the digital watermarking technology, then evaluated some typical watermarking algorithms by programming and experiments.2. Proposed a digital watermarking algorithm for copyright protection of digital image with the invisibleness and robustness. By analyzing the possible attack to the image media, and according to the HVS, it is made sure to add the watermark in the middle frequency region of DCT coefficients.3. Conducted experiments to analyze and evaluate the proposed algorithm. The results show proposed algorithm have strong robustness to general noise and attacks. The algorithm are realized and programmed in MATLAB environment. The experiment results show that the static image watermark emmded by proposed algorithm based on HVS and DCT is quite effective.