Optoelectronic device for videofrequency scanning of images

Details Optoelectronic device for videofrequency scanning of images Optoelectronic device for videofrequency scanning of images

1981-10-14

1983-12-27

Britton, Howard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358213, 250334, H04N 718

Patent

active

044234376

ABSTRACT:
The optoelectronic device comprises an optical element for producing an image scan and an optical element for focusing on an array of detectors. The detected signals are processed by amplifying circuits and a thermal-drift correcting unit comprising an occultation device having two states. A correction loop of the unit includes a memory for storing the values of amplifying circuit signals in the first state of the occultation device, a first circuit for subtracting the stored values from the amplifying circuit outputs in order to compensate for thermal drift, a measuring circuit for obtaining the mean value of the amplified videofrequency signals, and a second circuit for subtracting the mean value from the signal of each detector.

REFERENCES:
patent: 4118733 (1978-10-01), Sarson
patent: 4217608 (1980-08-01), MacGregor
patent: 4225883 (1980-09-01), Van Atta
patent: 4227210 (1980-10-01), Nixon
patent: 4298887 (1981-11-01), Rode
patent: 4307423 (1981-12-01), Atherton

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