Video Digital Double Watermark

With the rapid development technology of computer network and multimedia, the multimedia data have gradually become as the important resource where people get information and an important component of people's life. Meanwhile, the protection of the digital copyright for product owner has become more and more important. Through embed secret data in the original data, watermark could keep the ownership or integrality thus it can protect the digital product from pirate, tamer and so on. As an important method of protecting copyright, watermarking technology has been widely applied in many different fields.In this paper, according the particular analysis of the general digital watermark elements, a novel double digital watermarking algorithm is proposed on the basis of wavelet transform and image sub-block technology for copyright protection of video sequence. Two kinds of digital watermarking, robust watermarking and fragile watermarking, are embedded to the same images. The algorithm proposed in this paper is mainly used copyright protection of image, that is to say, fragile watermarking later serves for robust watermarking first.Two important innovative ideas are listed as follows:First, an algorithm is presented based on the concept of wavelet block energy analysis. The algorithm vector images to three-level wavelet decomposition of the details of the third sub-graph are divided into non-overlapping blocks of the coefficient. According to the human eyes on the edge of the image texture and visual characteristics are not sensitive, the paper compares the same energy position of HL3 and LH3 sub-graph and chooses the block coefficient of a larger meaningful watermark embedding.Secondly, a video double digital watermarking algorithm is proposed, which adopts a lot of principles such as DCT, multi-embedding. The vulnerability of the watermark will be embedded into same image which has embedded robust watermark. The experiment data show that both of the algorithms have good robustness, and the imperceptibility of watermark can be guaranteed at the same time.