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Proceedings Paper

Method to extend dynamic range of CMOS image sensor using different frame-rate readout
Author(s): Masaaki Sasaki; Shoji Kawahito; Mitsuhito Mase; Yoshiaki Tadokoro
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Paper Abstract

In this article, we propose a method to extend the dynamic range of the CMOS image sensor to both high illumination and low illumination. A one-frame period is divided into a period of long accumulation for low illumination, and periods of short accumulation for high illumination. The sensor data accumulated for short time are read out several times, and all of data are added repeatedly in a processing unit integrated. The SNR dip at boundary of low illumination and high illumination regions is reduced by the integration of the short accumulated signals. Because the proposed method is independent of the type of pixel structure, the low-noise characteristics can be achieved, allowing to use, for example, 4-transistor APS with a pinned photo diode. If the ratio of the long accumulation time and the short accumulation time is 128 and the number of addition times is 8, the dynamic range is extended to 41.6dB and the SNR dip is -11 dB.

Paper Details

Date Published: 16 May 2003
PDF: 10 pages
Proc. SPIE 5017, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications IV, (16 May 2003); doi: 10.1117/12.482357
Show Author Affiliations
Masaaki Sasaki, Toyohashi Univ. of Technology (Japan)
Shoji Kawahito, Shizuoka Univ. (Japan)
Mitsuhito Mase, Shizuoka Univ. (Japan)
Yoshiaki Tadokoro, Toyohashi Univ. of Technology (Japan)

Published in SPIE Proceedings Vol. 5017:
Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications IV
Nitin Sampat; Ricardo J. Motta; Morley M. Blouke; Nitin Sampat; Ricardo J. Motta, Editor(s)

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