用于MP3作品版权保护的数字水印新算法

以MP3压缩攻击特点与听觉掩蔽特性为基础，提出了一种可用于MP3音乐作品版权保护的混合域数字音频盲水印算法．首先，结合MP3压缩等攻击特点，对原始数字音频进行自适应的分段处理；再对每个音频数据段进行DWT和DCT；最后，结合听觉掩蔽特性与MP3压缩攻击特点，自适应确定量化步长，并将水印信号嵌入到音频数据段的低频分量中．仿真实验表明，所提出的算法不仅具有较好的透明性，而且对诸如重新采样、重新量化、叠加噪声、低通滤波等攻击均具有较好的鲁棒性．特别地，该算法对于最为普通的MP3压缩攻击具有极强的抵抗能力（尤其是高压缩比下）．

New Digital Audio Watermarking Scheme for MP3 Music Copyright

On the basis of the characteristics of MP3 compression and local audio correlation, a new adaptive digital audio watermarking in DWT and DCT domain for protecting MP3 music copyright is proposed. Firstly,the original audio signal is adaptively cut into several audio segments according to the height of the watermark image. Secondly,the DWT and DCT are performed on the audio segments. Finally, the watermark is embedded into the low frequency components by adaptive quantization according to the local audio correlation and human auditory masking. The algorithm can extract the watermark without the help from the original digital audio signal. Experimental results show that the proposed watermarking algorithm is imperceptible and robust against various signal processing such as re-sampllng ,re-quantifying,noising adding and low pass filtering. Especially, our audio watermarking scheme is remarkably effective in resisting MP3 compression.