Static Image Digital Watermarking Algorithm Based On DCT Domain

In information days, the exchange of digital media has become a widespread phenomenon. However, the number of illegal entries is very easy to copy and reproduce, making the network information security have become increasingly prominent. Protection of intellectual property rights to digital works, the only registered its ownership has not be effective to protecting the legitimate rights and interests of the author. Therefore, digital media copyright protection and authentication source as the open network environment is an urgent need to address the issues. Digital watermarking technology as encryption technology added, is to protect the copyright of digital works an important means In recent years, academic studies have become a hot topic. As more than one of the emerging interdisciplinary subject, it involves the different fields of scientific ideas and theories. In recent years the theory and application have made tremendous development, But that is still not formed a complete theoretical system, there are still many unresolved issues, It can be said that digital watermarking technology is a vibrant and yet pioneering research field.The theme of the thesis is the Domain digital image watermarking algorithm, it complete the following main aspects : This paper describes the information hidden in the concept and classification, which leads to the concept of digital watermarking technology, discussion of the digital watermark technology concepts, features, and other related knowledge. Then the chaos in digital watermarking technology of progress. Chaos discussed the characteristics of dynamic systems, and chaotic digital watermark used on the edge.Analysis of the human visual system features, and given the DCT Walson visual model. Then achieved an adaptive algorithm is. To enhance the confidentiality watermark, the first two values of the watermark signal preprocessing : Logistic chaotic sequence using the watermark image encryption, according to human visual system JND value of embedding, embedded factor can be used to adjust. thus realizing the adaptive embedded. Experiments show that the algorithm has a good visual masking properties and shear, increase noise, compression and other attacks have good robustnessBefore the analysis of the performance of an algorithm on the basis of spread-spectrum technology in digital watermarking applications, Walsh also discussed the characteristics of code. Finally, the implementation of a code based on the orthogonal Walsh Spread Spectrum Watermarking algorithm. Experimental results show that compared to a previous algorithm, the algorithm has better performance.Digital watermarking technology is a new area, needs further in-depth study.