基于差分扩张和差分平移的无损信息隐藏算法  

Lossless data hiding based on difference expansion and difference shifting

作　　者：武丹[1,2] 汪国昭[1] 

机构地区：[1]浙江大学数学系计算机图像图形处理研究所,杭州310027 [2]中国计量学院数学系,杭州310018

出　　处：《吉林大学学报（工学版）》2010年第4期1071-1074,共4页Journal of Jilin University:Engineering and Technology Edition

基　　金：国家自然科学基金项目(60773179);'973'国家重点基础研究发展规划项目(2004CB318000);浙江省教育厅基金项目(Y200909370)

摘　　要：基于差分扩张和差分平移提出了一种新的无损信息隐藏算法。在按照一定的顺序扫描图像得到一个灰度序列后,用该算法计算序列中任意2个相邻像素之间的差分,将差分大于K-1(K是由用户根据嵌入容量所选择的一个正整数)的向右扩张,差分小于-K的向左扩张,介于-K、K-1之间的差分用来隐藏信息。并通过适当调整图像灰度使得嵌入信息后差分的改变均匀分布在2个像素上,保证了较好的图像质量。与目前几种常见算法进行比较发现,本文算法在保持相同峰值信噪比的基础上,能够嵌入更多的信息。Based on difference expansion and difference shifting a novel lossless data hiding algorithm is proposed. A sequence of pixels with grey levels is obtained by scanning the image in a given order. Then the difference of each adjacent pixel-pair is calculated. If the difference is larger than K-1 （ K is a positive integer chosen by the user based on the embedding capacity） ,it is shifted right; if the difference is smaller than-K,it is shift left; if the difference falls between-K and K-1,it is used to embed the data. At the same time the distortion caused by expansion is uniformly distributed to the two pixels,which keeps the high quality of the image. Experimental results demonstrate that the proposed scheme can embed a larger payload while keeping the same Peak Signal-to-Noise Ratio （ PSNR） .

关 键 词：计算机应用 无损信息隐藏 差分扩张 差分平移 

分 类 号：TP309[自动化与计算机技术—计算机系统结构]