CMOS image sensor with logarithmic response and self-calibrating fixed pattern noise correction

Markus Loose; Karlheinz Meier; Johannes Schemmel

doi:10.1117/12.324022

7 September 1998 CMOS image sensor with logarithmic response and self-calibrating fixed pattern noise correction

Markus Loose, Karlheinz Meier, Johannes Schemmel

Proceedings Volume 3410, Advanced Focal Plane Arrays and Electronic Cameras II; (1998) https://doi.org/10.1117/12.324022
Event: SYBEN-Broadband European Networks and Electronic Image Capture and Publishing, 1998, Zurich, Switzerland

Abstract

Optical CMOS sensor arrays have to cope with the problem of mismatch between individual pixels. This paper describes a CMOS camera chip with logarithmic response that has an automatic analog fixed pattern noise correction on chip. It was fabricated in an 0.8 micron process and consists of 64 X 64 active pixels. The photoreceptors show a measured response of about 100 mV per decade in light intensity and a dynamic range of more than 6 decades. Each pixel includes a capacitor to store the offset correction voltage. After applying the calibration procedure the remaining fixed pattern noise of one column has a standard deviation of 2 mV corresponding to 2 percent of a decade. The result is a system with significantly reduced pixel to pixel variations in comparison to similar uncalibrated photoreceptor arrays.

Citation Download Citation

Markus Loose, Karlheinz Meier, and Johannes Schemmel "CMOS image sensor with logarithmic response and self-calibrating fixed pattern noise correction", Proc. SPIE 3410, Advanced Focal Plane Arrays and Electronic Cameras II, (7 September 1998); https://doi.org/10.1117/12.324022

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