Study And Implementation Of Digital Audio Watermark Method Based On QR Decomposition

As the development and application of computers and Internet, multimedia data has become an important way for information acquirement. How to carry out copyright protection and ensure the security of the information has become one of the urgent problems to be solved in digital communication. As an effective way to solve this problem, digital watermark technique has attracted many attentions. Digital watermarking is a scheme to insert some information that can represent the author's identity into the original data, to verify the property or the integrity of them. As digital audio compression technique is more and more mature, music products like mp3 is widely spread on the internet. Digital audio watermark embeds image which is on behalf of the authors' information, signature and ID of products into music products to fulfill copyright protection.In this paper, three kinds of audio watermark techniques based on QR decomposition are discussed. Firstly, the meaning of the task, the research background, and the related concepts and characteristics are introduced. Some typical methods are reviewed as well. Secondly, basic background knowledge related is introduced. After that, considering the stability of QR decomposition, three kinds of digital audio watermarking methods based on QR decomposition are proposed. The idea of Independent Component Analysis (ICA) is utilized to realize a lifting wavelet domain multi-bit robust watermarking scheme in the first method. Aim at the requirement for the application that needs to protect the copyright and content authentication of the multimedia simultaneously, an ICA multipurpose watermarking scheme based on QR decomposition is given in the second method. The embedding order of different watermarks is no longer an issue to be considered. The robust watermark is multi-bit and the fragile watermark can give the authentication result as well as the tampered areas. The third method, a watermarking scheme based on BSS, gives a solution to overcome the length problem of the key. An audio watermarking scheme based on QR and dither quantization is proposed. This method is robust against common signal processing operations.Experimental results show that, all of the three methods can satisfy the requirements of transparency, robustness and security; the watermark signal can be extracted blindly; According to the stabilization of Singular Value Decomposition QR decomposition.