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。

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

Abstract: 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.

Key words: normalized shape adaptive DCT(NSA-DCT), arbitrarily shaped object, Hadamard transformation(HT)

中图分类号: 

• TP391