G-Channel Restoration for RWB CFA with Double-Exposed W Channel
AbstractIn 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
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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.
Park C, Song KS, Kang MG. G-Channel Restoration for RWB CFA with Double-Exposed W Channel. Sensors. 2017; 17(2):293.Chicago/Turabian Style
Park, Chulhee; Song, Ki S.; Kang, Moon G. 2017. "G-Channel Restoration for RWB CFA with Double-Exposed W Channel." Sensors 17, no. 2: 293.
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