Image sensing

Details Image sensing Image sensing

H - Electricity

01

L

345/1

H01L 27/148 (2006.01) H04N 5/30 (2006.01) H04N 3/15 (2006.01)

Patent

CA 1331048

ABSTRACT IMAGE SENSING. To maintain a maximum ratio of signal charge to background charge in a CCD image detector, a background level of illumination of the CCD is maintained at a minimum level consistent with adequate fast charge transfer. This is conveniently accomplished by varying the intensity of radiation from a source within the detector incident on the CCD in dependence upon comparison between an averaged video output of the detector and a reference signal characteristic of optimum illumination of the CCD.

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