基于相位恢复和数字全息的音频水印

提出了一种在数字全息技术中引入相位恢复算法的音频水印方法.用水印图像经相位恢复处理形成虚拟物光波与参考光波干涉,得到高对比度的傅里叶变换全息图.利用量化算法和离散余弦变换把数字全息图嵌入音频信号中,在水印提取过程中不需要原始音频信号的参与,并且采用密钥加强了水印的安全性.数值计算实验表明:该算法对有损压缩、重采样、低通滤波、噪音干扰等常用音频信号攻击均具有很好的稳健性.

Audio Watermarking Based on Phase Retrieval Algorithm and Digital Holography

A new approach of audio watermarking by use of phase retrieval algorithm and digital holography is proposed. The watermarking image is transformed into virtual object wave after phase retrieval algorithm. It interferes with the reference wave to form high contrast Fourier-transformed digital hologram. And the hologram is embedded into audio signal by quantification process and discrete-cosine-transform.The watermark can be extracted without the original audio signal and the security key provides a good security. Numerical experiments show that the algorithm is robust against common signal manipulations and attacks,such as lossy compression,re-sampling,low pass filter,noise,and so on.