Automatic focussing system for an optical system

Details Automatic focussing system for an optical system Automatic focussing system for an optical system

1981-12-03

1989-03-28

Buczinski, Stephen C.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821313, H04N 5232, H04N 314

Patent

active

048169196

ABSTRACT:
A focussing system in which a detection and processing device (2) scans the image plane, in raster fashion, to generate a video signal representing the intensity of radiation prevailing at successively scanned locations. A selection circuit (6) contains a programmable memory which generates addresses suitable for selecting discrete sets (S) of neighbouring locations and a circuit (7) is responsive to the addresses to access to a processing circuit (8) only those portions of the video signal which correspond to the sets (S) of locations. The processing circuit (8) generates difference signals representing differences of intensity between neighbouring locations and evaluates the number (P.sub.tm) of difference signals exceeding each of a number of preset threshold values (t.sub.m) to generate a histogram. The numbers constituting the histogram are then weighted and scanned to generate a control signal (F) representing the focus.

REFERENCES:
patent: 3983320 (1976-09-01), Ketchum et al.
patent: 4133606 (1979-01-01), Hosoe et al.
patent: 4193093 (1980-03-01), St. Clair
patent: 4250521 (1981-02-01), Wright

Affiliated with

Also associated with

Rating

Automatic focussing system for an optical system 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 focussing system for an optical system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic focussing system for an optical system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1663892