Research On Robust Digital Audio Watermarking Algorithms

The rapid development of the Internet, as well as the compression and transmission technology maturing, people can freely download a variety of digital multimedia data from the Internet. This has brought great convenience to our lives, however, brought about a series of security questions to the digital products. Therefore, how to protect the copyright and content integrity of the digital multimedia has to be the problems must be solved. Digital watermarking technology came into being. Digital Audio Watermarking is an important research direction of Digital watermarking. The paper focuses on the robust digital audio watermarking algorithm which applied for copyright protection, the main content is as follows:Firstly, the background and the meaning of this research, the digital audio watermarking technology and the basics theory used in this thesis are introduced in the paper, including the human auditory characteristics, the independent component analysis (ICA). discrete wavelet transform (DWT) and Singular Value Decomposition (SVD).Secondly, a digital audio watermarking scheme based on independent component analysis is proposed. Embedding algorithm is to calculate and sort the energy value of the low frequency coefficients which is give the wavelet transform to the segmented audio. And then select the larger energy value of the low frequency coefficients as an embedded point, in order to ensure the transparency and robustness of the audio. Finally, the mixing matrix coefficients and the watermark is linear mixed. Watermark extraction use the independent component analysis which is belong to the blind source separation, and achieve the blind extraction.Thirdly, a high-capacity digital audio watermarking algorithm based on singular value decomposition is proposed, that is to solve the watermark capacity issues. Singular value decomposition used in the watermark, pre-processing stage, the singular value which has the important information as the embedded information. The watermark information compressed means that the amount of information can be embedded greatly increased in the carrier audio, and watermark repeat embedded in the carrier audio to ensure the robustness of the algorithm.The main contributions of the paper are propose two kinds of robust audio watermarking algorithm, experimental results demonstrate the feasibility of the proposed algorithm, and the robust to the conventional attack.