基于DCT域的加密二值图像数字水印新算法  

An Encrypted Binary Image Digital Watermarking Algorithm Based on DCT

作　　者：王慧琴[1] 李人厚[1] 王志雄[1] 

机构地区：[1]西安交通大学系统工程研究所

出　　处：《小型微型计算机系统》2003年第1期103-106,共4页Journal of Chinese Computer Systems

基　　金："陕西省自然科学研究计划"基金(项目编号 :2 0 0 1X2 9)资助

摘　　要：数字水印技术是解决数字媒体版权保护的有效方法 .本文提出了一种基于 DCT(Discrete Cosine Transform)域的序列密码加密图像数字水印新算法 .利用线性移位寄存器产生序列密码 ,对二值图像水印进行加密 ,由于二值图像水印含有密钥信息 ,算法具有密码学意义下的安全性 .利用人类视觉系统 (HVS)的特性 ,将水印自适应地嵌入到原始宿主图像的 DCT域的直流和低频分量中 .大量仿真结果证明了该算法的有效性和鲁棒性 .Digital watermarking techniques have been considered as an effective solution to protecting the copyright of multimedia data. In this paper, an encrypted binary image digital watermarking algorithm based on DCT domain is proposed. At first, we design a binary image watermarking signal and encrypted it by a sequence cipher before it was embedded. Then, by exploiting the visual masking and texture characteristics of Human Visual System (HVS) to ensure the self adaptation, watermark was embedded into the DC and lower frequency coefficients of the original image. The experimental results show that the watermarks are invisible and robust against noise and commonly used image processing methods such as Guassian, Salt, Pepper noise, JPEG, crop procession etc.

关 键 词：HVS 图像数字水印 DCT 序列密码 线性移位寄存器 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]