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Sensors 2017, 17(2), 293; doi:10.3390/s17020293

G-Channel Restoration for RWB CFA with Double-Exposed W Channel

Yonsei University, Deptartment of Electrical and Electronic Engineering, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Korea
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Academic Editor: Fabrizio Lamberti
Received: 6 December 2016 / Revised: 26 January 2017 / Accepted: 30 January 2017 / Published: 5 February 2017
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [4610 KB, uploaded 5 February 2017]   |  

Abstract

In this paper, we propose a green (G)-channel restoration for a red–white–blue (RWB) color filter array (CFA) image sensor using the dual sampling technique. By using white (W) pixels instead of G pixels, the RWB CFA provides high-sensitivity imaging and an improved signal-to-noise ratio compared to the Bayer CFA. However, owing to this high sensitivity, the W pixel values become rapidly over-saturated before the red–blue (RB) pixel values reach the appropriate levels. Because the missing G color information included in the W channel cannot be restored with a saturated W, multiple captures with dual sampling are necessary to solve this early W-pixel saturation problem. Each W pixel has a different exposure time when compared to those of the R and B pixels, because the W pixels are double-exposed. Therefore, a RWB-to-RGB color conversion method is required in order to restore the G color information, using a double-exposed W channel. The proposed G-channel restoration algorithm restores G color information from the W channel by considering the energy difference caused by the different exposure times. Using the proposed method, the RGB full-color image can be obtained while maintaining the high-sensitivity characteristic of the W pixels. View Full-Text
Keywords: G-channel restoration; red–white–blue color filter array; multispectral image sensor G-channel restoration; red–white–blue color filter array; multispectral image sensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Park, C.; Song, K.S.; Kang, M.G. G-Channel Restoration for RWB CFA with Double-Exposed W Channel. Sensors 2017, 17, 293.

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