Researchoncopyrightrecognitiontechnologyofi Mageandvideo Works

With the appearance and popularization of Internet, digital products are used in daily life more and more extensive, people can get digital information more easily. However, the storage and dissemination of digital products also caused copyright protection problems of media works.As a powerful tool for copyright protection of digital media, digital watermarking technology has become a hot topic in the field of multimedia information security. But now study of robust watermarking technology also is not enough, the ability to resist geometric attacks of watermarking is always the hard issue. In addition, traditional digital watermarking algorithm is to embed the watermarking by modifying the media spatial or frequency domain information, this will lead to conflict between robustness and imperceptibility of digital watermarking. The zero watermarking is good to ease the conflict, the idea is to construct a unique identification watermarking using the important features of host media information. Therefore, how to find the important features of the media to construct watermarking has become the focus of the zero watermarking technology research. This dissertation studied traditional digital watermarking and zero watermarking algorithm, further enhanced the robustness of algorithms. The study includes the following aspects:Firstly, based on the analysis of the existing algorithm, this dissertation combined with the encryption features of discrete fractional random transform and the anti-shearing attack features of holographic watermark, put forward the digital watermarking algorithm based on DFRNT and digital holography, to improve the algorithm’s robustness and security.Secondly, in view of the problems that traditional embedded watermarking algorithm affecting the quality of works, this dissertation designed a zero watermarking algorithm based on the log polar coordinates transform. This algorithm extracted the works important feature by using edge detection technique to construct robust watermarking, then made logarithmic coordinates transformation on the watermarking to resist rotation attack, further improved the robustness of the algorithm.Finally, since any kind of algorithm could not resist all attacks, this dissertation combined with the advantages of digital watermarking and zero watermarking algorithm, designed the combination of the two kinds of watermarking copyright identification scheme. When any one of these algorithms (such as digital watermarking algorithm) is not detected, then use another algorithm (such as zero watermarking algorithm) to detect, maximize to extract the watermark to protect the copyright.The experimental results show that compared with the previous watermarking algorithm and zero watermarking algorithm, the performance of this dissertation proposed algorithm is improved in the aspect of anti attack. And the performance of two kinds of technology combined with the copyright identification scheme is better than simply using single algorithm.