抗任意旋转攻击的数字水印防伪技术  

Digital watermarking technology against arbitrary rotation attack

作　　者：包观笑 孙刘杰[1] 李毓彬[1] 于海娇[1] 

机构地区：[1]上海理工大学出版印刷与艺术设计学院,上海200093

出　　处：《光电子．激光》2015年第1期156-161,共6页Journal of Optoelectronics·Laser

基　　金：上海市教委科研创新重点(13ZZ111)资助项目

摘　　要：针对目前频率域水印技术无法有效抵抗旋转攻击的问题,提出一种基于结构相似性指数（SSIM,structural similarity）的抗旋转攻击数字水印算法。首先将水印与参考光干涉生成离散余弦变换（DCT）全息图像后;然后利用DCT嵌入到宿主图像的B通道中频域中;最后,在提取水印时,利用SSIM检测校正图像旋转角度后逆DCT得到水印。实验表明,以嵌入强度a=0.1嵌入后,含水印图像的峰值信噪比（PSNR）达到43,能有效的抵抗1－360°的旋转攻击,旋转校正精度可达1°。嵌入水印有很强的不可见性,提取水印清晰,嵌入量较大,旋转校正时需要原始图像,属于明水印。因此,本文算法能准确地从受到旋转、滤波、噪声、裁切和几何形变等攻击的宿主图像中提取水印,可用于版权方的版权保护需求。Aiming at the problem that the frequency domain watermarking technology can＇t resist rotation attacks effectively, this paper puts forward the digital watermarking algorithm against rotation attack based on structural similarity （SSIM）. Firstly,the watermark interferes with the reference light to generate discrete cosine transform （DCT） holographic image, and then it is embedded into the host image in B channel using the frequency domain DCT. Finally, in the watermark extraction, image tilt angle corrected the inverse DCT transform watermarking detection by SSIM. The experimental results show that for the embedding of watermark image with strength of a=0.1 ,the PSNR reaches 43 ,it can resist rotation attacks of 1-360° effectively, and the highest point can realize of rotation correction. The embedded watermark has strong invisibility extraction and high embedding capacity. So, by this algorithm the watermark is extracted from the host image accurately, from rotating, filtering, noise, cutting and the geometry deformation attack. The results of the study can be used in the proof of the copyright proprietors.

关 键 词：离散余弦变换(DCT) 全息 角度校正 结构相似性指数(SSIM) 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构] TN911.73[自动化与计算机技术—计算机科学与技术]