27 April 1999 Comparative analysis of SNR for image sensors with enhanced dynamic range
Author Affiliations +
Abstract
Dynamic range is a critical figure of merit for image sensors. Often a sensor with higher dynamic range is regarded as higher quality than one with lower dynamic range. For CCD and CMOS sensors operating in the integration mode the sensor SNR monotonically increases with the signal. Therefore, a sensor with higher dynamic range, generally, produces higher quality images than one with lower dynamic range. This, however, is not necessarily the case when dynamic range enhancement schemes are used. For example, suing the well capacity adjusting scheme dynamic range is enhanced but at the expense of substantial degradation in SNR. On the other hand, using multiple sampling dynamic range can be enhanced without degrading SNR. Therefore, even if both schemes achieve the same dynamic range the latter can produce higher image quality than the former. The paper provides a quantitative framework for comparing SNR for image sensors with enhanced dynamic range. We introduce a simple model to describe the sensor output response as a function of the photogenerate signal, dark signal, and noise for sensors operation in integration mode with and without dynamic range enhancement schemes. We use the model to quantify and compare dynamic range and SNR for three sensor operation modes, integration with shuttering, using the well capacity adjusting scheme, and using multiple sampling.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David X. D. Yang, David X. D. Yang, Abbas El Gamal, Abbas El Gamal, } "Comparative analysis of SNR for image sensors with enhanced dynamic range", Proc. SPIE 3649, Sensors, Cameras, and Systems for Scientific/Industrial Applications, (27 April 1999); doi: 10.1117/12.347075; https://doi.org/10.1117/12.347075
PROCEEDINGS
15 PAGES


SHARE
RELATED CONTENT

Design considerations for a low-noise CMOS image sensor
Proceedings of SPIE (March 13 2015)
Analysis of self-correcting active pixel sensors
Proceedings of SPIE (January 17 2005)
CMOS image sensor and its development trend
Proceedings of SPIE (August 06 2009)
Effect of pixel active area shape on imaging quality of...
Proceedings of SPIE (January 24 2008)
Nomenclature For Focal Surface Radiometry
Proceedings of SPIE (August 06 1980)

Back to Top