Synthesis of color filter array pattern in digital images
Synthesis of color filter array pattern in digital images
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DOI：
10.1117/12.805988
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发表时间：
2009-02
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影响因子：
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通讯作者：
Matthias Kirchner;Rainer Böhme
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文献类型：
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作者：
Matthias Kirchner;Rainer Böhme
提出了一种综合生成或恢复数字图像中典型彩色滤光片阵列（CFA）图案的方法。除其他外，这可能有助于从分析图像CFA结构的法医技术中隐藏操纵痕迹。对于连续信号，我们的解决方案使用二次成本函数保持最佳图像质量;并且可以有效地计算。我们的一般方法可以得到更有效的近似解决方案，实现线性复杂的像素数。CFA合成作为篡改隐藏技术的有效性及其上级图像质量得到了大型图像集和最先进的取证技术的实验证据的支持。本说明仅限于最相关的“拜耳”网格，但该方法也可以推广到其他布局。
We propose a method to synthetically create or restore typical color filter array (CFA) pattern in digital images. This can be useful, inter alia, to conceal traces of manipulation from forensic techniques that analyze the CFA structure of images. For continuous signals, our solution maintains optimal image quality, using a quadratic cost function; and it can be computed efficiently. Our general approach allows to derive even more efficient approximate solutions that achieve linear complexity in the number of pixels. The effectiveness of the CFA synthesis as tamper-hiding technique and its superior image quality is backed with experimental evidence on large image sets and against state-of-the-art forensic techniques. This exposition is confined to the most relevant 'Bayer'-grid, but the method can be generalized to other layouts as well.