摘要
针对加性水印中嵌入强度因子的自适应问题进行了研究,提出了一个基于信噪比的自适应音频水印算法.该算法在保证听觉质量的同时,利用信噪比自适应地调节嵌入强度因子,并将水印信号嵌入到音频数据经沃尔什-哈达玛变换后的低频系数中,水印检测时不需要原始音频信号参与.仿真实验结果表明该算法对诸如加噪、滤波、重量化、重采样和MP3压缩等常规信号处理具有较强的鲁棒性,可用于音频数据的版权保护.
This paper presents an adaptive and blind digital audio watermarking algorithm based on the Walsh- Hadamard transform （WHT） and signal-to-noise ratio （SNR）. A new observation on the adaptive problem of embed- ding strength factor for additive watermark is uncovered. To preserve the audio fidelity, the proposed algorithm utilizes SNR to adjust the embedding strength factor adaptively and the watermark bits are embedded into the WHT low frequency coefficients. When detected, the watermark can be extracted without the help from the origin digital audio signal. Simulation results show that the proposed algorithm can not only guarantee good imperceptibility, but also be robust against common signal processing such as noise addition, low-pass filtering, re-sampling, re-quantization, and MP3 compression.
出处
《武汉大学学报（理学版）》
CAS
CSCD
北大核心
2012年第6期551-556,共6页
Journal of Wuhan University:Natural Science Edition
基金
国家自然科学基金资助项目(60842006)
关键词
数字水印
音频水印
沃尔什-哈达玛变换
信噪比
自适应
digital watermarking
audio watermarking
Walsh-Hadamard transform
signal-to-noise ratio
adap-tivity
