On The Technique Of Digital Video Watermarking And Its Application In Digital Museum

Aiming at problems of right protection and security of multimedia information in digital museum, some researches about video watermarking technique are carried out as follows:1. A texture based algorithm applied to uncompressed video is presented. Because human vision has different sensitivity to different texture, this method uses texture autocorrelation function to get texture information and divide the video picture into blocks. Inserts watermarks into the each block. This can achieve more robustness than current spatial domain algorithms.2. After analyzing compressed video watermarking algorithms, an algorithm embedded watermarking information into DC of I-frame chroma and intermediate frequency of Discrete Cosine Transferm (DCT) is proposed. This method not only enhanced robustness, but also increased.3. An improved algorithm based on motion vectors is presented. In which DWT's low frequency of 2-dimension image is embedded into DC of I-frame chroma of DCT, and DWT's middle frequency and high frequency of 2-dimension image is embedded into motion vectors. That improves invisibility and quantity of information embedded further.4. Using some criteria, the robustness of three video watermarking algorithms is evaluated, and their range and performance is shown.5. According to the algorithms presented in this paper, we implemented a multimedia watermarking system applicable to digital museum. This system achieved many watermarking algorithm, which can process 2-dimension, 3-dimension and video media respectively, and a balance among the quantity of information embedded, robustness and speediness of algorithm.