自适应小波变换的扩频音频数字水印

Spread spectrum audio digital watermarking based on adaptive wavelet transform

在分析了自适应小波变换特性的基础上,提出一种基于自适应小波变换的扩频音频数字水印算法。将二值水印图像降维处理转化为一维序列,再将一维序列与m序列做扩频调制,对音频信号进行分段做自适应小波变换,把经过扩频调制的水印信号经过量化处理嵌入到自适应小波变换后的系数中。模拟实验证明,该方法具有较好的不可感知性和鲁棒性。

The adaptive wavelet transform and spread-spectrum is analyzed at first, and a spread-spectrum digital audio watermarking based on the adaptive wavelet transform is proposed. The binary watermarking image is converted into a one-dimension sequence, which is modulated with the m-sequence, before the audio signal is finally divided into segments and adaptive wavelet transform is performed. The watermark can be extracted by adaptive wavelet transform on the audio signal embedded watermark. Simulation experimental results demonstrate that the technique is robust and imperceptible.