Picture division type automatic exposure control device for tele

Details Picture division type automatic exposure control device for tele Picture division type automatic exposure control device for tele

1981-07-20

1983-10-11

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 538

Patent

active

044096208

ABSTRACT:
An automatic exposure control circuit for a television camera which, irrespective of the illumination intensity of an object being photographed, provides a suitable exposure value at all times. The circuit includes a video signal extracting circuit for dividing a video signal for a field into a plurality of parts in a time division mode to selectively extract a specified picture region and a circuit for performing automatic exposure control in response to the selected video signal. The automatic exposure may be performed by a diaphragm control circuit including a rectifying circuit which operates upon the video signal corresponding to the extracted picture region and a circuit for maintaining the level of the video signal constant.

REFERENCES:
patent: 3495037 (1970-02-01), Hitz
patent: 3555181 (1971-01-01), Thommen
patent: 3576393 (1971-04-01), Thompson
patent: 4318132 (1982-03-01), Machida

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