A robust color signal processing with wide dynamic range WRGB CMOS image sensor

Shun Kawada; Rihito Kuroda; Shigetoshi Sugawa

doi:10.1117/12.872285

24 January 2011 A robust color signal processing with wide dynamic range WRGB CMOS image sensor

Shun Kawada, Rihito Kuroda, Shigetoshi Sugawa

Proceedings Volume 7876, Digital Photography VII; 78760W (2011) https://doi.org/10.1117/12.872285
Event: IS&T/SPIE Electronic Imaging, 2011, San Francisco Airport, California, United States

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.

Citation Download Citation

Shun Kawada, Rihito Kuroda, and Shigetoshi Sugawa "A robust color signal processing with wide dynamic range WRGB CMOS image sensor", Proc. SPIE 7876, Digital Photography VII, 78760W (24 January 2011); https://doi.org/10.1117/12.872285

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