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Journal of Electronic Imaging

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

Filter optimization is investigated to design digital camera color filters that achieved high color accuracy and low image noise when a sensor's inherent photon shot noise is considered. In a computer simulation, both RGB- and CMY-type filter sets are examined. Although CMY filters collect more photons, performance is worse than for RGB filters in terms of either color reproduction or noise due to the large noise amplification during the color transformation. When RGB filter sets are used and photon shot noise is considered, the peak wavelength of the R channel should be longer (620 to 630 nm) than the case when only color reproduction is considered: peak wavelengths 600, 550, and 450 nm for RGB channels, respectively. Increasing the wavelength reduces noise fluctuation along the a* axis, the most prominent noise component in the latter case; however, color accuracy is reduced. The tradeoff between image noise and color accuracy due to the peak wavelength of the R channel leads to a four-channel camera consisting of two R sensors and G and B. One of the two R channels is selected according to the difference in levels to reduce noise while maintaining accurate color reproduction.

Paper Details

Date Published: 1 April 2009
PDF: 14 pages
J. Electron. Imag. 18(2) 023002 doi: 10.1117/1.3116562
Published in: Journal of Electronic Imaging Volume 18, Issue 2
Show Author Affiliations
Hideyasu Kuniba, Rochester Institute of Technology (United States)
Roy S. Berns, Rochester Institute of Technology (United States)

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