基于量化表估计的 JPEG 合成图像盲检测

摘要

The key for locating tampered region using blocking artifact measure is to obtain a quantization table of original image accurately.This paper presents a method for estimating quantization table.Firstly, the quantization error of doctored image is obtained , which is compressed by different quality factor.Then the minimum is judged according to the quantization error, the quality factor of original image is one which corresponds with the minimum.Experiment results show that this method has high accuracy rate and low algorithm complexity in copy-move JPEG image detection.%利用块效应测度值大小定位篡改区域的关键在于能否准确得到原始图像量化表。本文研究一种量化表估计方法，首先将待测图像使用不同的质量因子对应的量化表求取量化误差，然后根据得到的量化误差进行极小值判定，极小值对应的质量因子即为原始图像量化表对应的质量因子。实验表明，该方法在检测JPEG复制粘贴型篡改时准确率高，算法复杂度小。