摘要
提出了一种基于量化的DCT域音频数字水印算法 ,该算法首先将视觉可辨的二值水印图像降维成一维水印序列 ,再将水印序列按伪随机排序 ,最后对数字音频信号作分段DCT变换 ,水印信号通过量化处理过程嵌入到DCT变换后的系数中 ,提取水印信号无需使用原始数字音频信号。仿真实验表明水印是不可察觉的 ,经过mp3有损压缩、低通滤波。
This paper presents a digital audio watermarking algorithm based on quantization in DCT domain. First, the visually recognizable binary watermark image should be converted into the one-dimensional sequence in the algorithm. The sequence is permuted pseudo-randomly as the watermark. Then the digital audio signal is converted into segments and discrete cosine transform is performed. Finally the watermark is embedded in coefficients in DCT domain by quantizing process. The method can extract the watermark without the original digital audio signal. The experimental results show that the watermark is imperceptible and the algorithm is robust to digital audio signal such as mp3 loss compression, low pass filter, resample and so on.
出处
《交通与计算机》
2004年第1期25-28,共4页
Computer and Communications
基金
湖北省自然科学基金资助 (2 0 0 1ABB0 84 )
关键词
数字水印
量化
版权保护
DCT变换
数字音频信号
digital watermarking
discrete cosine transform
quantization
copyright protection
