Calibration system for a raster input scanner

Details Calibration system for a raster input scanner Calibration system for a raster input scanner

1993-10-04

1995-04-04

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Facsimile measuring, testing, or calibrating

358466, 358464, 358462, H04N 146

Patent

active

054042321

ABSTRACT:
A photosensor for measuring the reflectivity of a surface is calibrated for consistent gain and offset. The reflectivities of a plurality of regions of a test surface are measured. An average of the measured reflectivities is calculated, and a threshold value related to the average is derived therefrom. A revised average of the measured reflectivities is then calculated, the revised average being an average of measured reflectivities only of regions having reflectivities of a predetermined relationship to the threshold value. Subsequent signals from the photosensor are then revised according to a function related to the revised average.

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