The Digital Watermarking System And Energy Adaptive Lsb Speech For Digital Watermarking

The digitization of the multimedia datum provides much convenience for the multimedia information's storage and extraction. It makes much improvement of the efficiency and veracity of information expression. With the development of the IC technology and the Internet, multimedia communication has improved to a unprecedented situation. People can distribute their writing and make trade through Internet. This brings a serious private problem.Up to now, Encryption cannot solve this problem entirely. Encryption can only protect the datum in the transmitting process. The digital watermarking technique has been thought the efficiency tool of the copyright protection.In this thesis' first part, the basic knowledge for digital watermarking in speech and image signal processing introduces, the traditional information security techniques and the information hiding techniques are introduced. Then constructs a frame of the digital watermarking system theory and discusses the digital watermarking background, definition, mathematical model, general properties and requires, classification, algorithm, the attacks and assess on digital watermarking and the present studies in digital watermarking. Finally, proposes a new adaptive LSB algorithm based on energy in time domain. The simulation results show a higher performance in transparency and robustness. This thesis has the innovation in constructing the frame of the digital watermark system theory and the time domain energy property based adaptive LSB audio digital watermarking algorithm.