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Correction of dark current in consumer cameras

[+] Author Affiliations
Justin C. Dunlap

Portland State University, P.O Box 751, Portland, Oregon 97207-0751

Erik Bodegom

Portland State University, P.O Box 751, Portland, Oregon 97207-0751

Ralf Widenhorn

Portland State University, P.O Box 751, Portland, Oregon 97207-0751

J. Electron. Imaging. 19(1), 013010 (March 12, 2010). doi:10.1117/1.3358365
History: Received November 17, 2009; Accepted January 19, 2010; Published March 12, 2010; Online March 12, 2010
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A study of dark current in digital imagers in digital single-lens reflex (DSLR) and compact consumer-grade digital cameras is presented. Dark current is shown to vary with temperature, exposure time, and ISO setting. Further, dark current is shown to increase in successive images during a series of images. DSLR and compact consumer cameras are often designed such that they are contained within a densely packed camera body, and therefore the digital imagers within the camera frame are prone to heat generated by the sensor as well as nearby elements within the camera body. It is the scope of this work to characterize the dark current in such cameras and to show that the dark current, in part due to heat generated by the camera itself, can be corrected by using hot pixels on the imager. This method generates computed dark frames based on the dark current indicator value of the hottest pixels on the chip. We compare this method to standard methods of dark current correction.

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© 2010 SPIE and IS&T

Citation

Justin C. Dunlap ; Erik Bodegom and Ralf Widenhorn
"Correction of dark current in consumer cameras", J. Electron. Imaging. 19(1), 013010 (March 12, 2010). ; http://dx.doi.org/10.1117/1.3358365


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