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Proceedings Paper

Sensor performance improvements for high-quality low-cost imaging systems in ophthalmic applications
Author(s): Andrei Plaian; Marco D'Aguanno; Paola Griggio
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Paper Abstract

CMOS sensors used in high-quality imaging systems of human eye require subtraction of the fixed pattern noise (FPN) to increase the signal to noise ratio (SNR). In this paper, we evaluated the efficiency of the FPN subtraction as a function of temperature (in the range from +70°C to -50°C) and integration time (from 12.5 to 287.5 ms) for a low-cost commercial CMOS sensor. We also compared the quality of the photos taken at different sensor temperatures on a phantom and on voluntary subjects. The experimental set-up includes a modified fundus camera for retinal examination (Centervue SpA, Italy) equipped with a 5Mpixel CMOS sensor and a temperature regulation system. The problem of water condensation on the sensor surface at low temperatures was overcome by using an original sensor sealing method.

Paper Details

Date Published: 16 February 2011
PDF: 10 pages
Proc. SPIE 7894, Optical Fibers, Sensors, and Devices for Biomedical Diagnostics and Treatment XI, 789407 (16 February 2011); doi: 10.1117/12.873834
Show Author Affiliations
Andrei Plaian, CENTERVUE SpA (Italy)
Marco D'Aguanno, CENTERVUE SpA (Italy)
Paola Griggio, CENTERVUE SpA (Italy)


Published in SPIE Proceedings Vol. 7894:
Optical Fibers, Sensors, and Devices for Biomedical Diagnostics and Treatment XI
Israel Gannot, Editor(s)

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