形状自适应的二维水印方法

Shape Adaptive 2-Dimension Watermark Algorithm

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.