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Proceedings Paper

Figure-of-merit for CMOS imagers
Author(s): Chi-Shao Lin; Frank Mau-Chung Chang; Bimal P. Mathur; David L. Standley
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Paper Abstract

Imagers designed for different system applications may comply with different requirements. Performance can be optimized only with an appropriate metric. A CMOS imager 'figure-of-merit (FOM)' for such a purpose is presented in this paper. It evaluates a CMOS imager from three performance categories: spatial resolution, sensing speed, and dynamic range. The sensing speed performance index (SP) is obtained by analyzing the imager signal-to-noise ratio versus exposure level. A modulation transfer function normalized to a 35 mm film standard assuming an identical field-of-view is introduced as the spatial resolution performance index (MTF35e_Avg), regardless of image sensor size. The dynamic range performance index, DR, is defined as ratio of the maximum signal level the imager is able to capture to its noise level. The tradeoffs among SP, MTF35e_Avg, and DR of a CMOS imager are quantitatively analyzed, and its FOM is found to be FOM equals DR X SP X (MTF35e_Avg)2. This paper also gives examples of optimized imager design using the proposed FOM.

Paper Details

Date Published: 24 April 2002
PDF: 11 pages
Proc. SPIE 4669, Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications III, (24 April 2002); doi: 10.1117/12.463436
Show Author Affiliations
Chi-Shao Lin, Univ. of California/Los Angeles (United States)
Frank Mau-Chung Chang, Univ. of California/Los Angeles (United States)
Bimal P. Mathur, Biomorphic VLSI Inc. (United States)
David L. Standley, Biomorphic VLSI Inc. (United States)


Published in SPIE Proceedings Vol. 4669:
Sensors and Camera Systems for Scientific, Industrial, and Digital Photography Applications III
Nitin Sampat; John Canosa; Morley M. Blouke; John Canosa; Nitin Sampat, Editor(s)

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