Choi Wonseok, Park Hyun Sang, Kyung Chong-Min
Opt Express. 2020 May 11;28(10):15678-15690. doi: 10.1364/OE.391253.
Many types of RGBW color filter array (CFA) have been proposed for various purposes. Most studies utilize white pixel intensity for improving the signal-to-noise ratio of the image and demosaicing the image, but we note that the white pixel intensity can also be utilized to improve color reproduction. In this paper, we propose a color reproduction pipeline for RGBW CFA sensors based on a fast, accurate, and hardware-friendly gray pixel detection using white pixel intensity. The proposed color reproduction pipeline was tested on a dataset captured from an OPA sensor which has RGBW CFA. Experimental results show that the proposed pipeline estimates the illumination more accurately and preserves the achromatic color better than conventional methods which do not use white pixel intensity.
为了各种目的，已经提出了许多类型的RGBW彩色滤光片阵列（CFA）。大多数研究利用白色像素强度来提高图像的信噪比并对图像进行去马赛克处理，但我们注意到白色像素强度也可用于改善色彩再现。在本文中，我们基于使用白色像素强度的快速、准确且硬件友好的灰色像素检测，提出了一种用于RGBW CFA传感器的色彩再现流水线。所提出的色彩再现流水线在从具有RGBW CFA的OPA传感器捕获的数据集上进行了测试。实验结果表明，与不使用白色像素强度的传统方法相比，所提出的流水线能更准确地估计光照并更好地保留消色差颜色。
