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一种基于小波变换的非均匀量化索引调制水印算法
引用本文:熊淑华,卜云,周激流.一种基于小波变换的非均匀量化索引调制水印算法[J].四川大学学报(工程科学版),2006,38(3):140-143.
作者姓名:熊淑华  卜云  周激流
作者单位:1. 四川大学,电子信息学院,四川,成都,610064
2. 电子科技大学,通信学院,四川,成都,610054
3. 四川大学,计算机学院,四川,成都,610064
摘    要:为了提高数字水印的稳健性与不可见性,将图像小波变换与量化索引调制算法相结合,提出了一种基于小波变换的非均匀量化索引调制数字水印算法。该算法对原始图像进行离散小波变换,将中频小波系数分成3×3的系数子块作为水印载体,对子块的系数均值采用非均匀量化索引调制,实现二值水印的嵌入。根据人类视觉特性,不同的系数子块采用不同的量化间隔并自适应于子块内相邻系数的差值。实验结果表明,该算法透明性好,安全性高,对高斯白噪声、剪切、滤波以及JPEG压缩等常见攻击具有较强的稳健性。

关 键 词:数字水印  离散小波变换  非均匀量化索引调制
文章编号:1009-3087(2006)03-0140-04
收稿时间:09 15 2005 12:00AM
修稿时间:2005-09-15

A Nonuniform Quantization Index Modulation Watermarking Algorithem
XIONG Shu-hua,BU Yun,ZHOU Ji-liu,FU Yuan-yuan.A Nonuniform Quantization Index Modulation Watermarking Algorithem[J].Journal of Sichuan University (Engineering Science Edition),2006,38(3):140-143.
Authors:XIONG Shu-hua  BU Yun  ZHOU Ji-liu  FU Yuan-yuan
Affiliation:School of Electronics and Info. Eng., Sichuan Univ., Chengdu 610064, China;School of Communication , Univ. of Electronic Sci. and Technol. of China, Chengdu 610054, China;School of Computer, Sichuan Univ., Chengdu 610064, China
Abstract:A nonuniform quantization index modulation watermarking algorithm based on image wavelet transform was presented to improve the robustness and invisibility of digital watermark. By taking discrete wavelet transform of original image, the middle-frequency wavelet coefficients, which were divided into small blocks, were selected as carrier of watermark information. A two-value watermark sequence was embedded into the mean values of block coefficients by applying non-uniform quantization index modulation. According to human vision system, different blocks used different quantization steps and were adaptive to the difference of adjacent coefficients. Experimental results showed that this algorithm can get a watermarked image with perceptual invisibility, high security and strong robustness against common image attacks.
Keywords:digital watermarking  discrete wavelet transform  nonuniform quantization index modulation
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