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Proceedings Paper

A signal-to-noise ratio comparison of high dynamic range CMOS image sensors
Author(s): Leo H. C. Braga; Suzana Domingues; José G. Gomes; Antonio C. Mesquita
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Paper Abstract

There have been many reports of application-specific or custom designed high dynamic range (HDR) CMOS image sensors. To achieve their extended dynamic range, these sensors utilize techniques that can significantly degrade their signal-to-noise ratios (SNR). We utilize a simplified sensor model to compare two HDR techniques with a conventional APS sensor regarding their SNR and dynamic range (DR). We perform a new analysis of a mixed APS and time-to-saturation sensor that shows that it can detect similar high illuminations levels that the multiple capture sensor without degrading the SNR at lower levels. Furthermore, the time-to-saturation sensor can be adjusted on-the-fly to detect specific illumination levels with optimized image quality.

Paper Details

Date Published: 18 May 2009
PDF: 10 pages
Proc. SPIE 7356, Optical Sensors 2009, 735619 (18 May 2009); doi: 10.1117/12.820367
Show Author Affiliations
Leo H. C. Braga, Univ. Federal do Rio de Janeiro (Brazil)
Suzana Domingues, Univ. Federal do Rio de Janeiro (Brazil)
José G. Gomes, Univ. Federal do Rio de Janeiro (Brazil)
Antonio C. Mesquita, Univ. Federal do Rio de Janeiro (Brazil)


Published in SPIE Proceedings Vol. 7356:
Optical Sensors 2009
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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