基于小波域低频系数的自适应数字音频水印算法

水印嵌入强度是影响水印鲁棒性的重要因素。该文设计了一种基于小波域低频系数自适应数字音频水印算法,利用混沌序列对水印加密,再将原始音频信号分段,对每段音频信号进行小波变换,嵌入强度由每段低频系数与低频系数最大值的比值自适应的选取,最后将水印嵌入到各段的低频部分。实验结果表明,水印在抵抗各种通用的音频处理和攻击(如高斯噪声、MP3压缩、重采样等)方面具有良好的鲁棒性。

An Algorithm of the Adaptive Digital Audio Watermarking Based on Wavelet Domain

The intensity of embedded watermarking is an important factor to impact watermarks robustness. This article designs an algorithm of adaptive digital audio watermarking based on the low frequency coefficients of DWT,the watermarking is encrypted by the chaotic sequence,then the original audio signal is divided into two parts,and carries on the wavelet transformation to the each section,finally the watermarking is embedded into the low frequency parts of each section,the embedded intensity is adaptively selected by the ratio of each section low frequency coefficients its maximum values.Experimental results show that the watermarking has better robustness against each kind of general audio manipulations and the attacks such as Gaussian noise,MP3 compression,resampling and so on.