一种可抵抗MP3压缩的音频水印算法

A Robust Adaptive Digital Audio Watermarking Scheme Against MP3 Compression

提出了一种稳健的自适应混合域数字音频水印算法,该算法具有以下特点:1)通过采纳更为稳健的同步信号及其全新嵌入策略,提高了音频水印的抗攻击能力;2)充分利用离散小波变换(Discrete wavelet transform,DWT)的多分辨率特性和离散余弦变换(Discrete cosine transform,DCT)的能量压缩特性,改善了数字水印的隐藏效果;3)结合听觉掩蔽特性自适应确定量化步长,提高了数字水印的不可感知性;4)以保证不可感知性和稳健性的良好平衡为前提,实现了数字水印的盲检测。仿真实验表明,所提出的算法不仅具有较好的不可感知性,而且对诸如重新采样、重新量化、叠加噪声、低通滤波、随机剪切等攻击均具有较好的稳健性．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)．

In this paper, a robust adaptive digital audio watermarking scheme in the hybrid domain is presented. The features of the proposed algorithm are as follows： 1）More robust synchronization codes and a new embedded strategy are adopted to resist the attack effectively. 2）The multi-resolution characteristics of discrete wavelet transform（DWT） and the energy-compression characteristics of discrete cosine transform（DCT） are combined to improve the transparency of digital watermark. 3）The adaptive quantization steps are identified according to human auditory masking. 4）The algorithm can extract the watermark without the help of the original digital audio signal. Experimental results show that the proposed watermarking algorithm is imperceptible and robust against various signal processings such as re-sampling, re-quantifying, noising adding, low pass filtering and cropping. Especially, our audio watermarking scheme is remarkably effective in resisting MP3 compression.