Video camera, method of photometry therein, and method of focusi

Details Video camera, method of photometry therein, and method of focusi Video camera, method of photometry therein, and method of focusi

1993-07-14

1994-12-27

Hjerpe, Richard

Television

Camera, system and detail

Combined image signal generator and general image signal...

348362, H04N 5232

Patent

active

053769643

ABSTRACT:
A video signal, which is obtained from a solid-state electronic image sensing device, is used to obtain a photometric value corresponding to the environment in which a subject is present. Photometric areas that differ for every field in one frame are set within a photographic area of a CCD. A luminance-signal component extracted from the video signal by a Y.sub.L synthesizing circuit is integrated by an integrating circuit, under the control of a CPU, with respect to a horizontal scanning interval and vertical scanning interval corresponding to the photometric area. Obtained integrated values are added field by field and a photometric value is calculated field by field from the value resulting from adding the integrated values.

REFERENCES:
patent: 4614974 (1986-09-01), Toyama
patent: 5049983 (1991-09-01), Matsumoto et al.
patent: 5077613 (1991-12-01), Hirao et al.
patent: 5185658 (1993-02-01), Shinomiya
patent: 5200828 (1993-04-01), Jang et al.

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