计算机工程与应用Issue(20)：202-206,5.DOI:10.3778/j.issn.1002-8331.1210-0357
基于JPEG双量化效应的图像篡改盲检测
Blind detection of tampered image based on JPEG double quantiza-tion effect
摘要
Abstract
The double quantization effect in JPEG images is becoming important clue in detecting image forgeries. As many detection methods are based on the block artifacts of DCT coefficients, a new blind detection scheme which makes use of the double quantization effect is proposed. By comparing two posteriori probabilities of untampered region, which are computed by histogram of DCT coefficients and interval length respectively, a feature that can distinguish the tampered block and untampered block is extracted, and then the feature value of each DCT block is calculated. After setting a threshold, the tampered blocks whose feature values are larger than the threshold are obtained. Finally, the tampered region is located by labeling the connected components. Experimental results demonstrate that the proposed scheme can detect and localize the tampered areas more accurately with respect to previously proposed methods, especially for colorful or rich texture images.关键词
双量化效应/盲检测/直方图/后验概率/连通区域Key words
double quantization effect/blind detection/histogram/posteriori probability/connected region分类
信息技术与安全科学引用本文复制引用
吴少宝,沈东升,李晓婉..基于JPEG双量化效应的图像篡改盲检测[J].计算机工程与应用,2014,(20):202-206,5.基金项目
福建省计算机应用技术和信号与信息系统研究生教育创新基地资助（闽高教[2008]114号）。 （）
