As a new information security technique, digital watermarking provides a new solution for the security protection of multimedia information. It has become a hot study in the field of information security, and has been deeply and widely studied. But there are many questions need to be solved. The paper aimed at the digital image and
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With the great development of multimedia technology and the popularity of Internet, distributing of digital products through Internet is more and more convenient. Meanwhile, the problem of multimedia copyright protection becomes increasingly serious. In recent years, robust and semi-fragile digital watermarking techniques become significant solutions to copyright protection. After analyzing the existing watermarking algorithms, a
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With the rapid development and wide use of multimedia and network technologies, the copyright protection for multimedia has become the most urgent problem to be solved. Particularly, the copyright protection method for 3D models are far from mature as that of other kinds of media like digital image, audio, video and text. The traditional encryption
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This dissertation studies theories of wavelet and digital watermarking, investigates main problems with digital media, studies image lossless compression algorithms and image demosaicing algorithms based on wavelet theories through combination with those problems, and studies copyright protection methods for digital media based on digital watermarking theories. It studies the copyright protection method for genuine media
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With the rapid development of multimedia and network technology, multimedia information can be conveniently distributed, transmitted, and processed with help of computer. Besides its easy of our lives, the digital product has security and copyright problems. It is vulnerable to attack and forgery and hard to track the manipulations. Due to the copyright problem, digital
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The development of digital technology not only brings convenience to people, but also makes us involved with troubles of information security. Digital image is main content of multimedia, and its capture, modification and transmission become more and more easy. The authentication, integrity verification of digital images and the argument of copyright restrict the development of
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