Exposure control device

Details Exposure control device Exposure control device

1997-04-07

1998-05-12

Faile, Andrew

Television

Camera, system and detail

Optics

348367, H04N 5235

Patent

active

057513520

ABSTRACT:
An exposure control device of a still-video camera has a CCD and a photoreceptor element for sensing a photometry value of an object. First, the camera is aimed at the main object in such a manner that the main object is positioned in the center of the frame, and a first photometry value is obtained. Then, the aim of the camera is changed so that the main object is offset from the center of the frame, and a second photometry value is obtained. A provisional exposure is carried out in accordance with an aperture value and an electric charge accumulating time which are obtained based on the second photometry value, and thus an exposure value is obtained. A ratio of the proper exposure value and the provisional exposure value is obtained. A normal exposure is carried out in accordance with the aperture value and a normal electric charge accumulating time TT=T.times.(E0/E2).times.(L2/L1), where T represents the electric charge accumulating time, E0 represents the exposure value, E2 represents the provisional exposure value, L2 represents the second photometry value, L1 represents the first photometry value, and TT represents the normal electric charge accumulating time.

REFERENCES:
patent: 4868667 (1989-09-01), Tani et al.
patent: 4984088 (1991-01-01), Tani et al.
patent: 5101276 (1992-03-01), Ohta
patent: 5282041 (1994-01-01), Tani et al.
patent: 5455621 (1995-10-01), Morimura
patent: 5589880 (1996-12-01), Tsukui

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