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Proceedings Paper

A day and night MOS imager spectrally adjusted for a wide range of color temperatures
Author(s): Shinzo Koyama; Keisuke Tanaka; Mitsuru Muguruma; Manabu Usuda; Kazuo Fujiwara; Toshinobu Matsuno; Yutaka Hirose; Yasuhiro Shimada
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Paper Abstract

We present a day and night MOS imager based on a single plate on-chip interference color filter. The filter comprises periodic multiple layers of TiO2 and SiO2, with an intermediate color selection layer (SiO2) to disturb the period of the layers, analogous to a "defect" layer in the one-dimensional photonic crystal. A particular advantage of this filter is flexibility of designing a spectral profile of each color. Thus, one unit cell of the present MOS imager is designed to have three multi-spectral, i.e. R+IR, G+IR, B+IR, pixels and one IR dedicated pixel, which would never be realized by ordinary pigment materials. Daytime color image signals are obtained by subtracting the IR pixel signal, as a reference, from each signal of R+IR, G+IR and B+IR pixels. Nighttime black and white imaging is simply realized by using the IR components of all the pixels as brightness signals. This enables seamless switching between the day and night operations of a camera. Although the subtraction operation usually reduces the dynamic range (DR) and signal-to-ratio (SNR), in particular at low color temperatures, we overcome the issues by employing a new design scheme of the color filter comprising double defect layers for each visible pass band and narrow IR pass bands for common IR components. As a result, signal degradations in SNR and DR are suppressed even at low color temperatures enabling daytime imaging in a wide range of color temperatures from 2300 K to 6500 K.

Paper Details

Date Published: 27 January 2009
PDF: 8 pages
Proc. SPIE 7249, Sensors, Cameras, and Systems for Industrial/Scientific Applications X, 72490S (27 January 2009); doi: 10.1117/12.807267
Show Author Affiliations
Shinzo Koyama, Panasonic Corp. (Japan)
Keisuke Tanaka, Panasonic Corp. (Japan)
Mitsuru Muguruma, Panasonic Corp. (Japan)
Manabu Usuda, Panasonic Corp. (Japan)
Kazuo Fujiwara, Panasonic Corp. (Japan)
Toshinobu Matsuno, Panasonic Corp. (Japan)
Yutaka Hirose, Panasonic Corp. (Japan)
Yasuhiro Shimada, Panasonic Corp. (Japan)

Published in SPIE Proceedings Vol. 7249:
Sensors, Cameras, and Systems for Industrial/Scientific Applications X
Erik Bodegom; Valérie Nguyen, Editor(s)

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