Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1981-07-31
1983-10-04
Griffin, Robert L.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358282, 382 50, H04N 140
Patent
active
044082312
ABSTRACT:
A linear image sensor and the video channel associated with the sensor are calibrated to maximize the video signal available. The sensor is limited in output by saturation of the CCD analog shift registers in the sensor. The channel is limited by the range of the analog-to-digital converter in the channel. The useable video signal is maximized by calibrating the sensor relative to its saturation condition and by adjusting the gain of the video channel relative to the range of the analog-to-digital converter. The sensor is calibrated by adjusting its exposure to illumination. The adjustment may be made by adjusting the illumination source or by changing the sampling interval for the sensor. The gain is adjusted by using a variable gain amplifier. A microprocessor monitors the digitized video signal and controls the exposure and gain to calibrate the sensor and channel.
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Bushaw Kenneth A.
Gillingham Ronald D.
Jorgenson Gary W.
Manning Clyde L.
Steffes Michael A.
Coles Edward L.
Griffin Robert L.
International Business Machines - Corporation
Knearl Homer L.
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