Color interpolation algorithm for an RWB color filter array including double-exposed white channel
Color interpolation algorithm for an RWB color filter array including double-exposed white channel
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DOI：
10.1186/s13634-016-0359-6
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发表时间：
2016-05-13
影响因子：
1.9
通讯作者：
Kang, Moon Gi
中科院分区：
文献类型：
--
作者：
Song, Ki Sun;Park, Chul Hee;Kang, Moon Gi
提出了一种用于红-白色-蓝色（RWB）彩色滤光片阵列（CFA）的颜色插值算法，该算法使用双曝光白色通道代替单曝光绿色（G）通道。双曝光RWB CFA图案在不同的曝光时间同时捕获两个白色通道，提高了灵敏度，并为W通道的快速饱和问题提供了解决方案，但由于缺乏合适的颜色插值算法，空间分辨率下降。该算法针对双曝光RWB CFA图案进行了设计和优化。利用方向色差信息对两个白色通道进行插值。红色和蓝色通道通过应用引导滤波器进行内插，该引导滤波器使用内插的白色通道作为引导值。所提出的方法解决了空间分辨率下降，特别是在水平方向上，这是一个具有挑战性的问题，在双重曝光RWB CFA图案。实验结果表明，该算法优于其他颜色插值方法的客观和主观标准。
In this paper, we propose a color interpolation algorithm for a red-white-blue (RWB) color filter array (CFA) that uses a double exposed white channel instead of a single exposed green (G) channel. The double-exposed RWB CFA pattern, which captures two white channels at different exposure times simultaneously, improves the sensitivity and provides a solution for the rapid saturation problem of W channel although spatial resolution is degraded due to the lack of a suitable color interpolation algorithm. The proposed algorithm is designed and optimized for the double-exposed RWB CFA pattern. Two white channels are interpolated by using directional color difference information. The red and blue channels are interpolated by applying a guided filter that uses the interpolated white channel as a guided value. The proposed method resolves spatial resolution degradation, particularly in the horizontal direction, which is a challenging problem in the double-exposed RWB CFA pattern. Experimental results demonstrate that the proposed algorithm outperforms other color interpolation methods in terms of both objective and subjective criteria.