基于倒谱变换的数字音频健壮盲水印算法

A Robust and Blind Digital Audio Watermarking Algorithm Based on Cepstrum Transform

提出一种基于倒谱变换的数字音频健壮盲水印算法。把音频信号划分为包含相同采样点的若干帧,对指定帧实施复倒谱变换,将复倒谱系数均值与阈值进行比较,结合水印序列为“0”或“1”,采取缩小、增加或不改变复倒谱系数均值的方法,在复倒谱系数中嵌入水印。实验证明,该算法具有较强的健壮性,较好的透明性,提取水印属盲水印提取,能经受添加噪声、重采样、低通滤波、重新量化、音频格式转换等常见信号处理及攻击。

This paper proposes a robust and blind digital audio watermarking algorithm based on cepstrum transform. The audio signal has been divided into several segments which including the same sample,the segment has been transformed with complex cepstrum,mean of complex cepstrum coefficient and threshold have been compared, according to watermark bit and adopting the way of reducing,increasing or not changing complex cepstrum coefficients, watermark has been embedded into the complex cepstrum coefficient.The experiment result shows that the algorithm is robust,transparent and blind against common signal processing manipulations and attacks,such as resampling,noise, low-pass filter,remodulation,conversion and so on.