JPEG合成图像的盲篡改检测及定位  

The Tampering Detection and Localization of JPEG Images

作　　者：刘丽娟[1,2] 林小竹[2] 

机构地区：[1]北京化工大学信息科学与技术学院,北京100029 [2]北京石油化工学院信息工程学院,北京102617

出　　处：《北京石油化工学院学报》2014年第2期26-31,共6页Journal of Beijing Institute of Petrochemical Technology

摘　　要：提出一种经过JPEG压缩且保存为BMP格式的图像盲篡改检测方法。该算法基于原始量化表不一致性实现篡改定位。首先根据压缩图像特性定位DCT块;然后依据块划分估计原始量化表;最后计算图像块偏离量化表程度,并寻找合适阈值,实现篡改区域的自动检测和定位。改进原始量化表估计算法的实验结果表明:改进算法能实现直流(DC)分量的量化系数估计,并提高量化表估计的正确率,且能有效检测单次JPEG压缩图像的篡改及定位。This paper proposed an algorithm to blindly detect the synthetic image which is BMP format tampered from JPEG format.The algorithm is based on JPEG quantization distortion.Firstly,the edge of DCT block is located according to the characteristics of compressed image.Secondly,the original quantitative matrix is estimated based on block classification,and then the image block deviation degree of quantization table is calculated.Finally,a suitable threshold is found to detect and locate the tampering area.The experimental results show that the new algorithm improves the accuracy of quantitative table estimation,and detects a single JPEG compressed image tamper and localization accurately.

关 键 词：压缩图像 量化表估计 块偏离量化表程度 盲篡改检测 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]