作　　者： ;

机构地区： 韩山师范学院数学与信息技术系

出　　处： 《光电工程》 2010年第8期67-75,共9页

摘　　要： 结合计算全息技术,提出一种新颖的抗几何攻击的鲁棒零水印算法。零水印构造过程中,先对小波变换后的宿主图像的低频子带进行分块,然后对每个分块进行奇异值分解并量化它们的最大奇异值,最后用得到的量化矩阵与全息水印构造零水印,并在IPR数据库注册获得版权保护。检测过程中,先用基于Zernike矩和不变质心的改进图像校正算法对几何失真图像进行校准,然后用校正后的图像进行水印检测。与传统的零水印算法及数字全息水印算法相比,本文算法具有更好的抗几何攻击性能。实验表明,该算法能有效地抵抗旋转、缩放、平移、翻转和旋转-缩放组合等几何攻击,同时对滤波、加噪声、JPEG压缩、图像模糊、裁剪和对比度增强等常规攻击也有很强的鲁棒性。 A novel geometric robust zero-watermarking scheme,which uses Computer Generated Holograms（CGHs） as the watermarks,is presented.In the zero-watermark construction process,the host image is decomposed with discrete wavelet transform and the low frequency sub-band is divided into nonoverlapping blocks.Singular Value Decomposition（SVD） is applied to every block.A quantization matrix is obtained by quantizing the largest singular value of each block.Using the quantization matrix and the mark CGH,the zero-watermark which is registered in the database of IPR can be constructed.In the detection process,the geometric distortion parameters of the attacked image are estimated first by the proposed improved geometric correction method based on the Zernike moments and invariant centroid.Then,the mark hologram is extracted from the recovered image.Compared with traditional zero-watermarking methods and digital hologram watermarking methods,the suggested watermarking scheme provides better performance for resisting geometric attacks.The experimental results demonstrate that the proposed watermarking scheme is robust against rotation,scaling,translation,flipping and combined attack,as well as a variety of common manipulations such as filtering,additive noise,JPEG compression,blurring,cropping and contrast enhancement.

关 键 词： 几何攻击 计算全息 零水印 矩 不变质心 奇异值分解

领　　域： [自动化与计算机技术] [自动化与计算机技术]