Video camera apparatus including automatic focusing

Details Video camera apparatus including automatic focusing Video camera apparatus including automatic focusing

2004-10-19

2008-11-25

Ho, Tuan V (Department: 2622)

Television

Camera, system and detail

Optics

C348S356000

Reexamination Certificate

active

07456898

ABSTRACT:
A video camera includes a gate circuit for extracting a sharpness signal relative to an area which is set in a portion of a picture, a focus adjusting device for performing focus adjustment on the basis of the sharpness signal relative to the area, and an area selecting circuit for controlling the gate circuit to vary the area in size and determining a size of the area during a driving of a variator lens in accordance with a size of the area and a focal length used before the driving of the variator lens.

REFERENCES:
patent: 5128768 (1992-07-01), Suda et al.
patent: 5619264 (1997-04-01), Yoshimura et al.

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