基于Contourlet变换域的自适应量化索引调制数字图像水印算法  

Adaptive Quantization Index Modulation Digital Image Watermarking Algorithm Based on Contourlet Transform Domain

作　　者：朱少敏[1] 刘建明[2] 

机构地区：[1]中国电力科学研究院,北京100192 [2]国网信息通信有限公司,北京100761

出　　处：《光学学报》2009年第6期1523-1529,共7页Acta Optica Sinica

摘　　要：提出了一种新的基于Contourlet变换域的自适应量化索引调制数字图像水印算法。原始二值水印经过扩展置乱、降维和伪随机序列加密,嵌入到宿主图像经Contourlet变换后的低通子带系数中。根据低通子带能量分布特性,对分块低通子带的最大奇异值采用自适应量化索引调制,实现水印嵌入。实验结果表明,该水印算法不仅对嵌入的水印具有良好地视觉保真度,而且对JPEG压缩、低通滤波、加性噪声、重采样、剪切等多种攻击具有很强的稳健性。同时采用量化嵌入策略,水印提取时不需要宿主图像,即可实现水印图像盲提取。A novel adaptive quantization index modulation digital image watermarking algorithm in contourlet transform domain is proposed. The original binary watermark image is preprocessed through extended scrambling, dimension reduction and pseudorandom sequence encryption. The secret watermark information bits are embedded into low-pass subband coefficients in contourlet transform domain. According to energy distribution in lowpass subband, the largest singular value of the selected lowpass subband coefficients blocks is adaptively operated by quantization index modulation for embedding watermark information. Experimental results show that the algorithm has good imperceptibility and robustness against the attacks of JPEG compression, low-pass filtering, additive noise, resampling and image cropping. Because of quantization embedding strategies, no host image is needed in watermarking extraction,which is a blind watermarking algorithm.

关 键 词：图像处理 Contourlet变换域 扩展置乱 能量分布 自适应量化索引调制 盲水印 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]