基于SVD局部数字水印算法  

Local Digital Watermarking Algorithm Based On SVD

作　　者：吕建平[1] 赵彩霞[1] 

机构地区：[1]西安邮电学院

出　　处：《微计算机信息》2010年第12期114-115,139,共3页Control & Automation

摘　　要：本文将水印嵌入和局部不易发生变化的特征点结合,首先利用多尺度Harris角点检测算法检测出图像的特征点;其次以局部最稳定的特征点为中心选取局部特征区域;最后对特征区域分块,利用奇异值分解后最大奇异值的稳定性,将水印嵌入在最大的奇异值上。实验证明,该算法不仅具有很好的不可见性,而且对一些图像攻击具有很好的鲁棒性,尤其是局部攻击。This paper combines the watermark embedding and local feature points together,Firstly,the multi-scale Harris corner de-tection algorithm is utilized to extract steady feature points from the original image;Then,the feature points are took as centres to se-lect the local feature regions;Finally,the Singular Value Decompostion（SVD） is used according to the stability of the largest singular value,and the watermark bits are embedded into the largest singular value of each block.Experimental results show that the algo-rithm is not only invisible,but also robust against some image attacks,especially to local attack.

关 键 词：多尺度Harris 局部特征区域 SVD 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]