采用几何校正优化的轮廓波水印算法  

Contourlet watermarking algorithm based on geometric correction optimization

作　　者：郑秋梅[1] 陈亚茹 林超 ZHENG Qiumei;CHEN Yaru;LIN Chao(College of Computer Science and Technology,China University of Petroleum(Huadong),Qingdao,Shandong 266580,China;Information Construction Department,China University of Petroleum(Huadong),Qingdao,Shandong 266580,China)

机构地区：[1]中国石油大学(华东)计算机科学与技术学院,山东青岛266580 [2]中国石油大学(华东)信息化建设处,山东青岛266580

出　　处：《光电子．激光》2022年第3期330-336,共7页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(52074341,51874340)资助项目。

摘　　要：针对目前的图像水印难以同时抵抗常规攻击和几何攻击的不足,提出一种新的轮廓波水印算法。水印嵌入阶段,该方法将宿主图像进行离散小波变换和非下采样轮廓波变换,并将水印嵌入到熵值最大的高频子带,解决了将水印嵌入低频无法抵抗几何攻击及高频不能很好抵抗滤波等常规攻击的问题。在水印嵌入前对嵌入区域进行加密处理,提高算法的安全性。水印提取阶段,利用Zernike矩对含水印图像进行几何校正再进行提取,进一步提高了算法的抗几何攻击能力。最后利用峰值信噪比和归一化系数对算法进行评价,验证算法的不可感知性和鲁棒性。仿真实验结果表明,算法在不同的宿主图像和水印图像上均表现良好。该算法在具有较好不可见性的基础上,除了对常规攻击具有很好的抵抗力,对几何攻击也具有强鲁棒性,归一化系数(normalization coefficient,NC)均达到了0.99以上。In view of the fact that the current robust watermarking is difficult to resist both conventional attacks and geometric attacks,a new contourlet watermarking algorithm is proposed.In this watermark embedding stage,the host image is transformed by discrete wavelet transform and non-subsampled contourlet transform,and the watermark is embedded into the high frequency subband with the maximum entropy,which solves the problems that embedding the watermark in the low frequency can not resist geometric attacks and high frequency can not resist conventional attacks such as filtering.The embedded area is encrypted before the watermark is embedded,which improves the security of the algorithm.In the watermark extraction stage,the watermark is geometrically corrected and extracted by using Zernike moments,which further improves the anti-geometric attack ability of the algorithm.Finally,the algorithm is evaluated by peak signal-to-noise ratio and normalized coefficient to verify the imperceptibility and robustness of the algorithm.Simulation results show that the algorithm performs well on different host images and watermark images.On the basis of good invisibility,the algorithm not only has good resistance to conventional attacks such as filtering and noise,but also has strong robustness to geometric attacks such as translation and rotation,and the normalization coefficient(NC)value is more than 0.99.

关 键 词：图像水印 非下采样轮廓波变换 几何校正 鲁棒性 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]