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Proceedings Paper

Spectral sensitivity optimization of color image sensor considering photon shot noise
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Paper Abstract

A filter optimization was investigated to design digital camera color filters that achieved high color accuracy and low image noise when accounting for a sensor's inherent photon shot noise. In the computer simulation, Gaussiantype spectral-sensitivity curves along with an IR blocking filter were used. When only color reproduction was considered, the best peak wavelengths for RGB channels were 600, 550 and 450nm, respectively, but when both color reproduction and photon shot noise were considered, the peak wavelength of the R channel should be longer (620 - 630nm). Increasing the wavelength reduced noise fluctuation along the a* axis, the most prominent noise component in the former case; however, color accuracy was reduced. The tradeoff between image noise and color accuracy due to the peak wavelength of the R channel led to a four-channel camera consisting of two R sensors and G and B. One of the two R channels was selected according to the difference in levels in order to reduce noise while maintaining accurate color reproduction.

Paper Details

Date Published: 3 March 2008
PDF: 12 pages
Proc. SPIE 6817, Digital Photography IV, 68170P (3 March 2008); doi: 10.1117/12.765565
Show Author Affiliations
Hideyasu Kuniba, Nikon Corp. (Japan)
Rochester Institute of Technology (United States)
Roy S. Berns, Rochester Institute of Technology (United States)

Published in SPIE Proceedings Vol. 6817:
Digital Photography IV
Jeffrey M. DiCarlo; Brian G. Rodricks, Editor(s)

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