基于混沌加密的DCT域灰度级盲水印算法  

A Gray-scale Blind Watermarking Algorithm in DCT Domain Based on Chaotic Encryption

作　　者：鲍政[1] 张建伟[1] 夏德深[2] 

机构地区：[1]南京信息工程大学数学系,南京210044 [2]南京理工大学计算机系,南京210094

出　　处：《计算机工程》2006年第7期157-159,162,共4页Computer Engineering

基　　金：香港特区政府研究资助局研究项目(CUHK/4180/01E;CUHK/1/00C)

摘　　要：结合混沌序列的优良特性给出了一个简单有效的图像混沌置乱算法,提出了一个在未压缩灰度级水印数据量的情况下,基于调整载体图像DCT块系数与其对应8邻域块DCT系数均值的关系,自适应嵌入水印信息的盲水印算法。实验结果表明,该算法对JPEG压缩、裁剪等常见的图像处理操作有较好的鲁棒性,具有一定的实用性。More and more researchers focus on meaningful digital watermarking, especially gray-scale watermarking, because it has much good advantage but is hard to deal with. First, this paper gives a simple but effective chaotic transform encryption algorithm of image, and then presents a gray-scale blind watermarking technique operating on DCT domain, which automatically embeds watermarking information by adjusting the relationship of coefficients of selected DCT block with the mean of corresponding coefficients of DCT blocks around the selected DCT block. The experimental results show that the proposed algorithm is effective and robust to common image processing operations and some geometric distortions such as JPEG compression and cropping. So a conclusion can be made that the proposed technique is practical.

关 键 词：离散余弦变换 混沌加密 灰度水印 盲提取 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]