Method of detecting focusing conditions

Details Method of detecting focusing conditions Method of detecting focusing conditions

1982-03-24

1985-09-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, 354406, G01J 120

Patent

active

045408815

ABSTRACT:
A method of detecting focusing conditions used for optical machinery is disclosed. The focusing conditions of an optical image projected onto photodetector arrays arranged on both sides of the focal plane with a certain optical distance are detected based on an evaluation function representing a sum of absolute values of differences between output signals of adjacent photodetectors. When a value of a first evaluation function represented by the largest absolute value is less than a predetermined threshold a second evaluation function represented by a sum of the maximum and next largest absolute values is used thereby detecting the focusing conditions for a graded image.

REFERENCES:
patent: 4133606 (1979-01-01), Hosoe et al.
patent: 4203031 (1980-05-01), Kamachi et al.
patent: 4320302 (1982-03-01), Stein
patent: 4352545 (1982-10-01), Uno et al.
patent: 4359634 (1982-11-01), Saito et al.
patent: 4412741 (1983-11-01), Stein

Affiliated with

Also associated with

Rating

Method of detecting focusing conditions 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 of detecting focusing conditions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of detecting focusing conditions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1430286