一种健壮透明的数字音频DWT水印算法

提出了一种基于离散小波变换(DWT,DiscreteWaveletTransform)的健壮、透明的数字音频水印算法。把音频信号划分为若干个包含相同采样点的帧,每帧划分为若干个包含相同采样点的节。对每帧的前两节实施小波变换,对前两节精细分量的能量进行比较,根据能量比较及水印比特,结合HAS特性,采用不改变或缩小精细分量能量的方法,在精细分量中嵌入水印。结果证明,该算法具有较强的健壮性、较好的透明性,能盲水印检测,可抵抗常见的音频处理及攻击,如:重采样、添加噪声、低通滤波、重新量化、转换等。

A Robust and Transparent Digital Audio Watermarking Algorithm in DWT

This paper presents a robust and transparent digital audio watermarking algorithm in DWT(Discrete Wavelet Transform).The audio signal has been divided into several frames including the same samples,and the frame has been divided into several sections including the same samples.The first two sections of each frame has been transformed by DWT,energy of detail coefficient of the first two sections has been compared,according to energy comparison and watermark bit,combining the features of HAS,and adopting the way of not changing or reducing energy of the detail coefficient,watermarks has been embedded into the detail coefficient.The result demonstrates that the algorithm is robust,transparent and blind against common signal processing manipulations and attacks,such as resampling,noise,low-pass filter,remodulation,conversion etc.