Exposure control device

Details Exposure control device Exposure control device

1994-07-21

2000-09-26

Ho, Tuan

Television

Camera, system and detail

Optics

348363, H04N 5238

Patent

active

061248916

ABSTRACT:
An exposure control device for performing exposure control on the basis of a video signal obtained from a light measuring area set within an image sensing plane is provided with a determining circuit which determines the position of a photographed object within the image sensing plane from the values of a specific component of the video signal obtained from the inside and outside of a detection area the position of which is variably set within the image sensing plane. The light measuring area is set in the object's position within the image sensing plane detected by the determining circuit. The exposure control device is provided further with a changing circuit which detects the size of the object on the image sensing plane and changes the size of the light measuring area accordingly, and a weighting circuit which performs for light measurement a weighting operation on video signals obtained from the inside and outside of the light measuring area.

REFERENCES:
patent: 4535364 (1985-08-01), Hirobe
patent: 4551764 (1985-11-01), Ogawa
patent: 4872058 (1989-10-01), Baba et al.
patent: 4987482 (1991-01-01), Imai et al.
patent: 5272538 (1993-12-01), Homma et al.

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