Method and apparatus for compensating for illumination variation

Details Method and apparatus for compensating for illumination variation Method and apparatus for compensating for illumination variation

1990-09-28

1992-10-06

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Facsimile measuring, testing, or calibrating

355203, 355228, 355208, 340516, 358475, H04N 140, G03B 2754, G03B 2772

Patent

active

051537451

ABSTRACT:
An illumination output from a fluorescent lamp used in a RIS type scanner is maintained at optimum by monitoring the lamp's on/off state and turning the lamp on for a time period following a specified cumulative off time. In one example, the lamp is turned on for a two minute interval following a one hour off time. Following the two minute on period, a diagnostic test is automatically performed to determine whether variations in the lamp output have resulted in an out of specification condition requiring that the lamp be recalibrated to the photosensor array. The calibration is automatically enabled by adjusting the gain of the photosensor array until the photosensor response is within the nominal percentage range. The scanner is then returned to a standby mode. All of the tests are performed automatically and normal operations can be accomplished while the lamp is in warm up phase.

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Keillor et al. "Optical Scanner Maintenance . . ." IBM Tech. Discl. Bull. vol. 19 No. 1 Jun. 1976.

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