Image pick-up apparatus

Details Image pick-up apparatus Image pick-up apparatus

1989-06-02

1990-09-25

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Recording apparatus

358211, H04N 5238

Patent

active

049597272

ABSTRACT:
A video camera comprises an image sensor for converting a projected light image into an electrical signal, an exposure time setting circuit for setting the exposure time for the image sensor to either one of a normal exposure time and an exposure time longer than the normal exposure time, and an automatic gain control circuit including a variable gain amplifier for amplifying a video signal read out from the image sensor and a detector for detecting an output signal level of the variable gain amplifier and supplying a gain control signal based on the result of detection to the variable gain amplifier. The automatic gain control circuit is controlled so as to make the response speed of the automatic gain control circuit, when the exposure time is set to an exposure time longer than the normal exposure time, lower than that preset when the exposure time is set to the normal exposure time.

REFERENCES:
patent: 4739411 (1988-04-01), Bolton
patent: 4746988 (1988-05-01), Nutting et al.
patent: 4780766 (1988-10-01), Nutting
patent: 4868667 (1989-09-01), Tani et al.
patent: 4894723 (1990-01-01), Takaiwa

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