基于局部特征区域的抗RST图像水印算法  

Region Based on Local Regions Image Watermarking Against RST

作　　者：王彩霞[1] 

机构地区：[1]运城学院公共计算机教学部,山西运城044000

出　　处：《山西师范大学学报（自然科学版）》2010年第4期58-62,共5页Journal of Shanxi Normal University(Natural Science Edition)

摘　　要：本文提出了一种新的基于特征点的抵抗RST攻击的图像水印算法.该算法利用Harris-Laplace检测器从原始图像中提取不变特征点,并结合特征尺度自适应确定用于水印嵌入的局部特征区域.为了达到旋转不变性,通过极坐标变换形成与特征区域相适应的圆环水印,并将水印重复嵌入到多个互不重叠的特征区域中.利用特征点来标识水印的嵌入位置,检测时不需要原始图像.仿真结果表明,该算法不仅具有较好的透明性,而且对常规信号处理和旋转、尺度等几何攻击均具有较好的鲁棒性.In this paper,a feature-based algorithm robust to RST attacks for image watermarking is proposed.The Harris-Laplace detector isutilized to extract invariant feature points.The local regions for watermarking are adaptively constructed according to the characteristic scale.Rotation invarianee is achieved by using the polar-mapped circular watermark,and several copies of the watermark are embedded into the non-overlapped local regions.By localizing the watermark positions with image features,watermark detection can be accomplished without original image.Experimental results show that the proposed scheme is not only invisible but also robust against common signal processing and geometric attacks.

关 键 词：图像水印 几何攻击 特征检测器 HARRIS-LAPLACE 

分 类 号：TP301[自动化与计算机技术—计算机系统结构]