Method of controlling automatic focusing in a video camera for d

Details Method of controlling automatic focusing in a video camera for d Method of controlling automatic focusing in a video camera for d

1996-12-11

2000-11-21

Ho, Tuan

Television

Camera, system and detail

Optics

348229, 348358, 348353, H04N 5232

Patent

active

061510726

ABSTRACT:
A method of controlling automatic focusing in a video camera which has an automatic focusing means for focusing a taking lens in a contrast detecting method, an automatic iris means for controlling an iris according to the brightness of an object, and an automatic gain controlling means for increasing gain of a video signal obtained from image pickup means when a signal level of the video signal is low. The taking lens is made to focus on a point at infinity if the following three conditions are fulfilled: the iris is fully opened by the automatic iris means, and the gain is increased to the maximum extent possible by the automatic gain controlling means, and the taking lens is in a wide-angle state. Thereby, even in the dark at night, the photographing can be performed with the object being in focus.

REFERENCES:
patent: 4931821 (1990-06-01), Hamada et al.
patent: 5349382 (1994-09-01), Tamura
patent: 5604537 (1997-02-01), Yamazaki et al.

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