基于LWT-DCT-QR混合域的音频信号水印算法

摘要

In order to improve the robustness of audio watermarking,a watermark embedding method is presented based on the LWT-DCT-QR mixed domain.It integrates the advantages that the lifting wavelet transform speed is fast,discrete cosine anti transform holds interference ability and QR decomposition has good numerical stability,and achieves image watermarking embedding and extraction.Through attacks tests of noising,sampling,filtering,cropping,compression,the security of watermark,perception,and robustness are guaranteed.Correlation coefficients of watermark signal (NC) and signal to noise ratio (SNR) are computed to complete the analysis and evaluation.The results show that the proposed watermarking algorithm has strong anti attack ability,and has certain advantages compared with the related literature.%为提高音频水印的鲁棒性,设计了一种基于LWT-DCT-QR混合域的水印嵌入方法,充分发挥提升小波变换运算速度快、离散余弦变换抗干扰能力强以及QR分解数值稳定性好的特点,并通过Logistic混沌序列进行加密,从而实现水印图像的嵌入与提取.通过噪声、采样、滤波、剪切、压缩等攻击对水印的安全性、不可感知性以及鲁棒性进行了仿真与测试,并利用水印信号的相关系数(ⅣC)和信噪比(SNR)进行分析评定.测试结果表明,所提出的水印算法具有较强的抗攻击能力,与相关文献相比具有一定的优越性.