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利用JPEG块效应不一致性的合成图像盲检测

DOI: 10.11834/jig.20091132

Keywords: 数字取证,块效应,篡改检测,被动认证

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Abstract:

合成图像的篡改对象和背景区域一般来源于不同的JPEG图像。为了快速有效地检测这种图像篡改,提出了一种盲检测JPEG合成图像的方法。首先将图像与Laplacian模板卷积得到二阶差分图像,沿水平(垂直)方向平均后进行离散Fourier变换得到归一化的频谱,基于频谱幅值构造JPEG块效应测度;然后将待检测图像重叠分块并计算其相应块效应测度,利用块效应不一致性检测篡改区域。实验结果表明,该方法是快速有效的。

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