针对二值图像分块奇偶密写的统计分析  

Statistical Analysis of Binary Image against Block Parity Steganography

作　　者：梁光岚[1] 王朔中[1] 张新鹏[1] 

机构地区：[1]上海大学通信与信息工程学院,上海200072

出　　处：《上海大学学报（自然科学版）》2007年第3期221-224,共4页Journal of Shanghai University:Natural Science Edition

基　　金：国家自然科学基金资助项目(6037209060502039)

摘　　要：一种实现简单的二值图像密写方法是将图像分为2×2的小块后利用边缘块的奇偶性来隐藏秘密信息.将含密图像以不同行列作边界分块时,图像块像素和的直方图存在明显差异,且非边缘块的数目变化较大.这一异常会暴露秘密信息的存在.通过将含密图像错位分块后作二次密写,并统计不同分块方式下非边缘块数目的变化量,可估计出嵌入量.该方法容易实现,实验验证了该方法的有效性.An effective data hiding method for binary images divides the cover image into 2-by-2 blocks and embeds 1 bit in each edge block by making use of the parity of the block-sum. In this paper a steganalytic scheme is described against this technique. The proposed scheme uses difference between histograms of the block-sum when the block border is changed. By removing the top row and the left-most column to crop the suspected image, a test embedding is performed. This is used for estimating the initial embedding rate. Simulation results show that the proposed method can provide a satisfactory estimate of the embedding capacity.

关 键 词：二值图像密写 密写分析 直方图 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]