Method and system for detecting whether an optical system is in

Details Method and system for detecting whether an optical system is in Method and system for detecting whether an optical system is in

1989-03-21

1989-11-28

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, 354402, 354406, G01J 120, G03B 300

Patent

active

048839515

ABSTRACT:
In a focus detection system in which light from an object is incident on at least two photosensor arrays via an optical system to form two images on the photosensor arrays, the relative displacement between the two images is determined in order to detect whether the optical system is in focus or not. A correction term which is formed by f(i.sub.0 +2) and f(i.sub.0 +1) or f(i.sub.0 -2) and f(i.sub.0 -1) is added to f(i.sub.0-1)-f(i.sub.0) or f(i.sub.0 +1)-f(i.sub.0), so that the amount of image deviation between the two images is obtained. Here i.sub.0 is the value of i when a function f(i) is minimized, the function f(i) expressing the inconsistency between the two images, corresponding to an amount of relative displacement i.times.p between the two images obtained discretely. The symbol p represents the pitch of the at least two photosensor arrays.

REFERENCES:
patent: 4004852 (1977-01-01), Pentacost
patent: 4333007 (1982-06-01), Langlais et al.
patent: 4336450 (1982-06-01), Utagawa et al.
patent: 4412741 (1983-11-01), Stein
patent: 4556789 (1985-12-01), Shotaro et al.
patent: 4559446 (1985-12-01), Suzuki
patent: 4561749 (1985-12-01), Utagawa
patent: 4572476 (1968-02-01), Oinone
patent: 4602153 (1986-07-01), Suzuki
patent: 4606630 (1986-08-01), Haruki et al.
patent: 4611910 (1986-09-01), Suzuki et al.
patent: 4640613 (1987-02-01), Yokoyama et al.
patent: 4652119 (1987-03-01), Suzuki et al.
patent: 4695156 (1987-09-01), Taft
patent: 4709138 (1987-11-01), Suda et al.

Affiliated with

Also associated with

Rating

Method and system for detecting whether an optical system is in does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and system for detecting whether an optical system is in , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and system for detecting whether an optical system is in will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-583837