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Proceedings Paper

A robust color signal processing with wide dynamic range WRGB CMOS image sensor
Author(s): Shun Kawada; Rihito Kuroda; Shigetoshi Sugawa
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Paper Abstract

We have developed a robust color reproduction methodology by a simple calculation with a new color matrix using the formerly developed wide dynamic range WRGB lateral overflow integration capacitor (LOFIC) CMOS image sensor. The image sensor was fabricated through a 0.18 μm CMOS technology and has a 45 degrees oblique pixel array, the 4.2 μm effective pixel pitch and the W pixels. A W pixel was formed by replacing one of the two G pixels in the Bayer RGB color filter. The W pixel has a high sensitivity through the visible light waveband. An emerald green and yellow (EGY) signal is generated from the difference between the W signal and the sum of RGB signals. This EGY signal mainly includes emerald green and yellow lights. These colors are difficult to be reproduced accurately by the conventional simple linear matrix because their wave lengths are in the valleys of the spectral sensitivity characteristics of the RGB pixels. A new linear matrix based on the EGY-RGB signal was developed. Using this simple matrix, a highly accurate color processing with a large margin to the sensitivity fluctuation and noise has been achieved.

Paper Details

Date Published: 24 January 2011
PDF: 6 pages
Proc. SPIE 7876, Digital Photography VII, 78760W (24 January 2011); doi: 10.1117/12.872285
Show Author Affiliations
Shun Kawada, Tohoku Univ. (Japan)
Rihito Kuroda, Tohoku Univ. (Japan)
Shigetoshi Sugawa, Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 7876:
Digital Photography VII
Francisco H. Imai; Feng Xiao, Editor(s)

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