Spectral sensitivity optimization of color image sensor considering photon shot noise

Hideyasu Kuniba; Roy S. Berns

doi:10.1117/12.765565

3 March 2008 Spectral sensitivity optimization of color image sensor considering photon shot noise

Hideyasu Kuniba, Roy S. Berns

Proceedings Volume 6817, Digital Photography IV; 68170P (2008) https://doi.org/10.1117/12.765565
Event: Electronic Imaging, 2008, San Jose, California, United States

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.

Citation Download Citation

Hideyasu Kuniba and Roy S. Berns "Spectral sensitivity optimization of color image sensor considering photon shot noise", Proc. SPIE 6817, Digital Photography IV, 68170P (3 March 2008); https://doi.org/10.1117/12.765565

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available