Automatic centerfocus control circuit of a video apparatus

Details Automatic centerfocus control circuit of a video apparatus Automatic centerfocus control circuit of a video apparatus

1991-09-06

1993-09-28

Razavi, Michael T.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358228, H04N 5232, H04N 5238

Patent

active

052490572

ABSTRACT:
An automatic control circuit of the depth of focus of a video shooting apparatus for automatically controlling the depth of focus in control of a shutter speed on centerfocusing comprises a switch for switching on the state of the established centerfocus if a control command of centerfocus is applied by a user, a microcomputer for outputting the control signal of the shutter speed to a shutter selector if the state of the established centerfocus is received, a sample and hold circuit for sampling and holding an image signal of an image element controlled by the shutter speed selected from the shutter selector, and a level detection for detector the level of the shutter speed provided by the sample and hold circuit to control the operation of the microcomputer.

REFERENCES:
patent: 4495520 (1985-01-01), Kravitz et al.
patent: 4660092 (1987-04-01), Nutting
patent: 4739409 (1988-04-01), Baumeister
patent: 4825293 (1989-04-01), Kobayashi et al.
patent: 4879600 (1989-11-01), Ise et al.
patent: 4972266 (1990-11-01), Tani
patent: 5008757 (1991-04-01), Kimura et al.

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