Mass Watermarking Of Multimedia

With the fast developments of networking technologies and multimedia technologies, there is an increasing demand of information security protection and multimedia authentication technologies. Nowerdays, the copyright protection is in great demand, especially in the case of search engine, video ordering and online music. This thesis mainly focuses on the magnitude watermarking and its implementation and the main contributions of this thesis are as follows:1. Considering the illegal downloading and spreading of digital media, a framework which works finely to protect the digital media copyrights under the massive circumstance. The framework combines the traditional copyright protection and search engine technologies and it consists of video-audio watermarking embedding, digital media retrieval and media authentication. The video-audio watermarking embedding algorithm is composed of video and audio watermarking embedding algorithms which can be widely used; both the content-based retrieval and text-based retrieval algorithms consititute the digital media retrieval algorithms; the media authentication mainly validates media watermarking and other information related to the internet.2. A monitor system of mass multimedia is implemented. The goal of the system is to monitor and correct the behavior of search engine.3. A blind watermarking technology is proposed in this paper to facilitate video-audio watermarking embedding and security authentication of the framework. Put the blemishes of traditional copyright protection technologies and the principles of zero watermarking into consideration, an energy span fuction is proposed. Based on the function, a watermarking embedding and detection model which can deal whith the massive digital media is proposed. The model can make use of abundant information in digital media themselves and experiments show that the model is robust and the performance is remarkable when dealing with massive multimedia objects.4. According to the blind watermarking technology, we present a novel watermarking algorithm of MPEG video based on visual features. An effective mixed feature model of the block is delicately designed by texture, luminance and motion features of the video. According to the perceptual features derived from the masking behavior of the human perceptual model, a feature statistics model is introduced to adjust the extracted block feature, and then the copyright protection is embedded into the block according to the modified block feature. Experimental results show that the watermarked video is highly imperceptible robust.