Auto-focusing system for video camera

Details Auto-focusing system for video camera Auto-focusing system for video camera

1982-06-21

1985-02-19

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 526

Patent

active

045009252

ABSTRACT:
An auto-focusing system for a video camera using the focus signal extracted by a focus signal extracting device from high-frequency components of the video signal. A gate circuit is provided in front of the focus signal extracting device and the gate circuit is made conductive or non-conductive depending on the magnitude of the focus signal thereby to control the quantity of the video signal received by the focus signal extracting device, whereby the dynamic range of the focus signal extracting device is virtually expanded.

REFERENCES:
patent: 3617633 (1981-11-01), Barr
patent: 4301478 (1981-11-01), Sakane
patent: 4320417 (1982-03-01), Hanma
patent: 4354204 (1982-10-01), Kimura

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