Study And Implementation On The Digital Audio Watermarking Technique

As the prevalence and of rapid development computers and Internet, digital multimedia product has been applied widely. How to carry out copyright protection, copyright protection and information security on the Internet has become one of the urgent problems to be solved in digital communication. The development of digital watermark technique becomes a novel way to solve this problem. As music products like MP3 are widely spread on the Internet, digital audio watermarking technique becomes an internationally hot topic at present.In this paper, the main task focuses on digital audio watermarking scheme. And then, watermarking image restoration scheme is also provided, which is based on the audio watermarking scheme. Two kinds of digital audio watermarking schemes based on Independent Component Analysis (ICA) and one kind of watermarking image restoration scheme based on codebook mapping and blocked discrete Hopfield network are provided in this paper. Firstly, the meaning of the task and the research background are introduced. Secondly, basic background knowledge related is introduced. After that, two kinds of digital audio watermarking schemes based on ICA in wavelet transformed domain are proposed. Aiming at the problems that most existing digital audio watermarking schemes can weakly resist time-scale attack, and copyright protection and Region of Interest (ROI) of audio signal protection, a multipurpose digital audio watermarking scheme in the wavelet transformed domain based on ICA and synchronization is proposed, which realizes two purposes: ROI important audio segment protection and single copyright protection. Aiming at multiple copyrights protection, important segment audio content protection and tampered areas localization, a multiple and multipurpose audio watermarking scheme in the wavelet transformed domain based on ICA is proposed, which embeds one ROI audio signal and two image signals into the host signal. Owning two important characters: multiple and multipurpose, this scheme achieves the purpose of tampering localization only embedding robust watermarking signals, but not fragile watermarking signals. At last, aiming at the effective copyright protection even when the copyright symbols have undergone serious attacks, a watermarking image restoration scheme based on codebook mapping and blocked discrete Hopfield network is proposed, which solves the large space assuming problem of weight matrix of Hopfield network by codebook mapping, and enhances the network restoration performance by blocking scheme and reducing correlation of watermarking images.Experimental results show that both of the two audio watermarking schemes can satisfy the requirements of transparency, robustness and security, and can be applied in copyright protection, content protection or tampered areas localization; the blurred watermarking image restoration scheme can improve the performance of the traditional watermarking system and achieve the purpose of the copyright protection more effectively.