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基于局部能量方差特性的数字图像取证

, PP. 280-284

Keywords: 数字图像取证,计算机生成图像,反取证,局部能量方差

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Abstract:

在数字图像取证领域,如何高效甄别自然图像和计算机生成图像受到越来越多的关注。文中介绍一种数字图像取证算法,通过傅里叶变换计算图像像素之间的相关性,并利用频域的局部抖动来区别照相机拍摄的自然图像和计算机生成的图像。同时提出对计算机生成图像采取插值处理和对自然图像进行缩放处理的反取证方法,并且分析这两种反取证技术的应对方法。与Gallagher等的方法相比,文中基于数字图像局部能量方差特性的取证准确率更高,且能有效抵抗图像的反取证。

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