Dark frame subtraction

Details Dark frame subtraction Dark frame subtraction

1998-05-27

2000-08-08

Grant, II, Jerome

Image analysis

Image enhancement or restoration

Intensity, brightness, contrast, or shading correction

358463, G06K 940, H04N 5217

Patent

active

061012874

ABSTRACT:
A method of adjusting a portion of a dark frame in accordance with compensation values related to dark reference pixels of a picture frame to obtain an adjusted dark frame portion, and then subtracting the adjusted dark frame portion from a corresponding picture frame portion. The technique may be used to improve the accuracy of image sensors such as those used in digital cameras or video conferencing cameras by compensating for dark current noise. The technique may be applied to both CMOS image sensors and, in general, to any image sensors requiring dark frame subtraction. The techniques may also be used in conjunction with calibration of image sensors and imaging systems.

REFERENCES:
patent: 4200934 (1980-04-01), Hofmann
patent: 4703442 (1987-10-01), Levine
patent: 4739495 (1988-04-01), Levine

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