基于QDCT和HVS的双彩色图像水印算法  

Dual Color Image Watermarking Algorithm Based on QDCT and HVS

作　　者：经正俊 齐刚 JING Zhengjun;QI Gang(Information Technology Department,Guodian Nanjing Automation Co.,Ltd.,Nanjing 210044,China)

机构地区：[1]国电南京自动化股份有限公司信息技术事业部,江苏南京210044

出　　处：《电子科技》2020年第8期21-27,共7页Electronic Science and Technology

基　　金：中国华电集团电力监控系统安全防护评估科研项目(HD20181277)。

摘　　要：针对水印中信息容量、不可见性和鲁棒性相互制约的问题,文中提出了一种基于QDCT和HVS的双彩色图像水印算法。该算法首先将彩色载体图像和彩色水印图像进行QDCT;然后根据HVS的特性决定水印信息的嵌入位置与嵌入强度,并结合广义Arnold变换和冗余嵌入策略,将水印QDCT系数嵌入到载体图像QDCT系数的实部和虚部。实验结果表明,通过该算法嵌入水印后的彩色图像在PSNR为35 dB时,在常见攻击下提取出的水印大部分NC值高于0.95,水印信息具有更好的不可见性与鲁棒性。Aiming at the mutually restricted problem of information capacity,invisibility and robustness in watermarking,a dual color image watermarking algorithm based on QDCT and HVS was proposed.With this algorithm,a colored carrier image and a colored watermarking image were subject to QDCT.The embedding location and strength of watermarking information were decided based on the characteristics of HVS.Based on the generalized Arnold transform and redundant embedding strategy,the QDCT coefficient of the watermarking image was embedded into the real part and imaginary part of the QDCT coefficient of the carrier image.The experiment result showed with this algorithm,most of NC values of the watermark extracted under common attacks were higher than 0.95 and the watermark information possessed better invisibility and robustness for the colored watermark-embedded image when PSNR was 35 dB.

关 键 词：四元数 四元数离散余弦变换 人类视觉系统 广义Arnold变换 冗余嵌入 双彩色图像水印 

分 类 号：TN918[电子电信—通信与信息系统] TP309.2[电子电信—信息与通信工程]