Photoelectric receiver with local brightness adaptation

Details Photoelectric receiver with local brightness adaptation Photoelectric receiver with local brightness adaptation

1985-09-19

1987-09-15

Hix, L. T.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

250332, 250334, H01J 3149

Patent

active

046943331

ABSTRACT:
A photoelectric receiver for picture recording equipment, particularly for thermal-image equipment having local brightness adaptation, comprises at least one first detector element for providing point-by-point scanning of the image generated by an optical receiving system, as well as at least one second detector element associated with one or several of the first detector element(s) having a larger radiation-sensitive area for picking up at least part of the surroundings of a picture point picked up by a first detector element. The second detector element determines the gain, with which the signals of the first detector element(s) are amplified for the formation of video signals.

REFERENCES:
patent: 4072863 (1978-02-01), Roundy
patent: 4158137 (1979-06-01), Menke
"Natur und Wissenschaft" from Frankfurter Allgemeine Zeitung of Jun. 18, 1975, No. 137, p. 1.

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