形状自适应的二维水印方法  

Shape Adaptive 2-Dimension Watermark Algorithm

作　　者：李成[1] 毕笃彦[1] 

机构地区：[1]空军工程大学工程学院信号与信息处理实验室,西安710038

出　　处：《计算机工程》2007年第19期158-160,167,共4页Computer Engineering

摘　　要：针对图像中含主要信息区域或任意感兴趣区域的保护,提出一种基于标准化形状自适应离散余弦变换(NSA-DCT)的形状自适应二维水印方法,对载体图像中用户选定的任意形状对象嵌入二维水印信息(一幅灰度图像),实现了水印图像的有效提取和恢复。攻击实验表明该算法可以抵抗常见的图像攻击手段,具有水印不可见性和较强的鲁棒性。　Aiming at protecting regions consisting of most information or regions of interest（ROI） selected by users in the image,this paper proposes a 2-dimension watermark algorithm for the arbitrarily shaped object based on normalized shape-adaptive DCT,which can embed a gray image’s watermark to an arbitrarily shaped object in the cover-image.It achieves efficient watermark’s extraction and restoration.Experimental results show that this scheme is robust to common signal processing procedures with property of invisibility.

关 键 词：标准化形状自适应离散余弦变换 任意形状对象 哈达玛变换 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]