Automatic focusing device

Details Automatic focusing device Automatic focusing device

1997-03-25

2000-07-11

Garber, Wendy

Television

Camera, system and detail

Optics

348352, 348355, H04N 5232, G03B 1300

Patent

active

060880600

ABSTRACT:
An automatic focusing device for automatically controlling the focused state of an optical system on the basis of a video signal obtained within a focus detecting area which is set on an image sensing plane comprises: a tracing area setting circuit arranged to movably set, within said image sensing plane, an inner tracing area and an outer tracing area which surrounds the inner tracing area; a computing circuit arranged to compute information on a difference in a given frequency component of the video signal obtained from the inner and outer tracing areas in each of their different positions to which they are moved within the image sensing plane; determining means for determining the position or size of an object's image formed within the image sensing plane from the difference information computed by the computing circuit; and a circuit which is arranged to shift the focus detecting area to the position of the object's image determined by the determining circuit and to change the size of the focus detecting area according to the size of the object's image.

REFERENCES:
patent: 4405940 (1983-09-01), Woolfson et al.
patent: 4409661 (1983-10-01), Romanski
patent: 4644397 (1987-02-01), Roy et al.
patent: 4701782 (1987-10-01), Duvent
patent: 4794459 (1988-12-01), Moberg et al.
patent: 4796187 (1989-01-01), North
patent: 4872058 (1989-10-01), Baba et al.
patent: 5031049 (1991-07-01), Toyama
patent: 5031449 (1991-07-01), Toyama et al.
patent: 5128768 (1992-07-01), Suda et al.

Affiliated with

Also associated with

Rating

Automatic focusing device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic focusing device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic focusing device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-547129