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Proceedings Paper

A novel Bayer-like WRGB color filter array for CMOS image sensors
Author(s): Hiroto Honda; Yoshinori Iida; Go Itoh; Yoshitaka Egawa; Hiromichi Seki
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Paper Abstract

We have developed a CMOS image sensor with a novel color filter array(CFA) where one of the green pixels of the Bayer pattern was replaced with a white pixel. A transparent layer has been fabricated on the white pixel instead of a color filter to realize over 95% transmission for visible light with wavelengths of 400-700 nm. Pixel pitch of the device was 3.3 um and the number of pixels was 2 million (1600H x 1200V). The novel Bayer-like WRGB (White-Red-Green-Blue) CFA realized higher signal-to-noise ratios of interpolated R, G, and B values in low illumination (3lux) by 6dB, 1dB, and 6dB, respectively, compared with those of the Bayer pattern, with the low-noise pre-digital signal process. Furthermore, there was no degradation of either resolution or color representation for the interpolated image. This new CFA has a great potential to significantly increase the sensitivity of CMOS/CCD image sensors with digital signal processing technology.

Paper Details

Date Published: 12 February 2007
PDF: 10 pages
Proc. SPIE 6492, Human Vision and Electronic Imaging XII, 64921J (12 February 2007);
Show Author Affiliations
Hiroto Honda, Toshiba Corp. (Japan)
Yoshinori Iida, Toshiba Corp. (Japan)
Go Itoh, Toshiba Corp. (Japan)
Yoshitaka Egawa, Toshiba Corp. (Japan)
Hiromichi Seki, Toshiba Corp. (Japan)

Published in SPIE Proceedings Vol. 6492:
Human Vision and Electronic Imaging XII
Bernice E. Rogowitz; Thrasyvoulos N. Pappas; Scott J. Daly, Editor(s)

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