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基于能量比的小波域音频水印算法暴晋飞 柏 森 朱桂斌 柏玉保


摘 要:利用人耳听觉掩蔽特性,采用小波变换和幅度调制的方式,实现了一种新的复杂度低、鲁棒性强的音频水印算法。该算法通过计算音频在不同分帧长度下攻击前、后的平均能量比,选择最佳的分帧长度,通过调制音频低频系数的幅度值来改变每帧音频信号的能量比,从而达到嵌入水印的目的。实验结果表明,该算法具有很好的不可感知性,且能够抵抗诸如低通滤波、加噪、重采样、回声、A/μ率转换、MP3压缩及各种去同步攻击。
  关键词:音频水印; 小波变换; 能量比; 去同步攻击
  中图分类号:TP391 文献标志码:A
  文章编号:1001-3695(2010)03-1035-04
  doi:10.3969/j.issn.1001-3695.2010.03.063
  
  Audio watermarking algorithm based on energy ratio in DWT domain
  
  BAO Jin-fei, BAI Sen, ZHU Gui-bin, BAI Yu-bao
  
  (Chongqing Communication Institute, Chongqing 400035, China)
  
  Abstract:Based on DWT and amplitude modulation, using the auditory masking property, this paper proposed a novel audio watermarking algorithm with low complexity and high robustness . Through the way of calculating the average per-frame energy ratio of audio in different frame length before or after different kinds of attacks, and chose the best frame-length. In order to embed the secret information, changed the per-frame energy ratio through the way of modulate the amplitude of low frequency coefficients. Experimental results show that the watermarked audio has good imperceptibility and is robust against different kinds of attacks, such as low-pass filtering, noise adding, resampling, echo,A/μ law conversion,MP3 compression. It also can resist the attacks of desynchronizations. ......
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