Video Watermarking Method Against Copy Attack

With the popularization and development of the network, the sharing of digital products becomes more easily and frequently. The copyright protection of multimedia works is imminent. Digital watermarking technology is the primary means to protect digital copyright. So the necessary of study is evident. Digital watermark information hidden in the digital works, along with the spread of digital works, thus the watermark is vulnerable to a variety of intentional or unintentional attacks. To ensure the robustness of video watermarking, study on video watermarking against common method of attack is a critical task.The main content consists of two parts: the first is based on the analysis of the research background, current status, study content; describes the basic principles of video watermarking, the typical algorithm of common attack types and difficulty, and then elaborates on one of the watermarking against common attacks - copy attack and the impact of the implementation methods, ultimately proposes a new video watermarking generation method, using the algorithm embedded watermark video watermarking system can resist copy attack. The second part introduces the development process of "watermark extraction part" in the "random theory based video watermarking system ", features of the system is to achieve that the same video can choose different watermark embedding and extracting watermarking algorithm, and also each algorithm embedded proportion can be adjusted. While "Watermark extraction", the system can not only identify watermark information, but also identify the watermarking algorithm used.Goal of this thesis is to propose a new video watermarking algorithm, which can effectively resist copy attack, which not only enhances the robustness of video watermarking system, but also provides a new way of thinking for the watermark. "Random theory based video watermarking system" provides the necessary tool for the random theory research of video watermarking, and services as a wealth of practical project experience.