Focus control apparatus having two focusing speeds

Details Focus control apparatus having two focusing speeds Focus control apparatus having two focusing speeds

1989-03-02

1991-04-02

Orsino, Joseph A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

354404, H04N 326

Patent

active

050050869

ABSTRACT:
A focus control system for a video camera determines a first gradient indicative of a change in value of a predetermined frequency component in the video signal for first and second positions obtained from the signal of predetermined frequency component in the video signal sampled at the first lens position and at the second lens position, and determines a second gradient indicative of a change in value of the predetermined frequency component in the video signal for second and third lens positions obtained from the signal of the predetermined frequency component in the video signal sampled at the third lens position point, and the speed of longitudinal movement of the lens is controlled in accordance with changes in the first and second gradients, thereby permitting faster focusing and reducing the amount of overrun of the lens during such focusing.

REFERENCES:
patent: 4342905 (1982-08-01), Fujii et al.
patent: 4354204 (1982-10-01), Kimura
patent: 4422097 (1983-12-01), Inuiya
patent: 4572642 (1986-02-01), Yamamoto et al.
patent: 4672456 (1987-06-01), Murai et al.
patent: 4701782 (1987-10-01), Duvent
Japanese Patent Abstracts, vol. 10, No. 197 (2253) 7/10/86.
Japanese Patent Abstracts, vol. 10, No. 50 (2107) 2/27/86.

Affiliated with

Also associated with

Rating

Focus control apparatus having two focusing speeds does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Focus control apparatus having two focusing speeds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focus control apparatus having two focusing speeds will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-330154