一种DWT与DCT相结合的音频数字水印技术  

An Audio Digital Watermark Technology Based on DWT and DCT

作　　者：王兰勋[1] 尹超[1] 

机构地区：[1]河北大学电子信息工程学院,河北保定071002

出　　处：《电声技术》2006年第7期32-34,38,共4页Audio Engineering

摘　　要：提出了一种将离散小波变化与离散余弦变换相结合的音频数字水印技术。利用离散小波变换的多分辨率特性和离散余弦变换的能量压缩能力,通过修改变换域的低中频系数,把降维后的二值图像嵌入到原始数字音频信号中。该算法可同时应用两种变换,而且嵌入和提取水印的方法简单。实验结果表明该算法水印不易破坏,对数字音频信号的低通滤波、叠加噪声等攻击均具有很好的隐蔽性和稳健性。An audio digital watermark algorithm based on DWT（Discrete Wavelet Transform） and DCT（Discrete Cosine Transform）is presented. The multi-resolution of DWT and the energy compression of DCT are used. The binary image is embedded in the original audio by modifying the coefficients of low frequency and intermediate frequency. The algorithm using two kinds of transforms is easy to embed and extract watermark. The experimental results show that the watermark can not be destroyed easily and the algorithm is robust and imperceptible.

关 键 词：数字水印 离散小波变换 离散余弦变换 

分 类 号：TN912.3[电子电信—通信与信息系统]