基于插值替换的小波域音频水印算法  

Audio Watermarking Algorithm Based on Substitution by Interpolation in Wavelet Domain

作　　者：柏玉保[1] 柏森[1] 暴晋飞[1] 曾伟[1] 

机构地区：[1]重庆通信学院,重庆400035

出　　处：《重庆理工大学学报（自然科学）》2011年第2期74-79,共6页Journal of Chongqing University of Technology：Natural Science

基　　金：重庆市自然科学基金资助项目(CSTC;2008BB2296)

摘　　要：对一个给定信号的采样点集进行插值可以得到近似的数值点,利用该性质提出了一种基于插值替换的小波域音频水印算法。首先对话音信号整体进行小波分解,将其划分成若干频带,然后根据人耳听觉的频率掩蔽效应,选择出对人耳听觉不敏感的频带所对应的小波系数,将其分帧后采用样条函数插值来实现水印的嵌入。实验表明,嵌入水印后的语音信号不仅具有良好的不可感知性,而且对诸如加噪、低通滤波、重采样、重量化、回声、Mp3压缩、去同步等攻击具有很强的鲁棒性。Interpolation of a sample set from a signal gives a close mathematical and hence,a perceptually similar approximation to the original samples.A watermarking algorithm in wavelet domain using spline interpolation was proposed according to its property.First the host audio is decomposed by wavelet transform to several frequency bands,then select an frequency band which is insensitive to the human audio system and has the biggest hearing margin,and at the same time convert these coefficients to segments.Finally embed the watermarking information using spline interpolation.Experimental results show that the watermarked audio has good imperceptibility and is robust against different kinds of attacks,such as noise adding,low-pass filtering,resampling,requalization,echo,Mp3 compression,desynchronizations.

关 键 词：音频水印 插值 样条插值 离散小波变换 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]