Automatic focus control by use of component value differences in

Details Automatic focus control by use of component value differences in Automatic focus control by use of component value differences in

1994-07-20

1995-06-06

Couso, Yon J.

Television

Camera, system and detail

Optics

348352, H04N 5232

Patent

active

054226716

ABSTRACT:
An automatic focusing device comprises a binary coded information producing unit for producing binary coded information by comparing the levels of a predetermined component in each of a plurality of areas set on an image sensing plane of and image sensor with a predetermined value, a first detector for comparing binary coded information in each of the plurality of areas in one field with that in another field among a plurality of fields differing timewise from each other to produce a signal based on the difference between the two binary coded information, a second detector for detecting a total value, for one image plane, of differences in the predetermined component between adjacent areas among the plurality of areas of the image sensing plane, a computing unit for obtaining a degree of relative variations in information on images formed on the image sensing plane in different fields by computing the result of detection made by the first and second detectors and a control unit for controlling a focus adjusting action on the basis of an output of the computing unit.

REFERENCES:
patent: 4639767 (1987-01-01), Suzuki
patent: 4661853 (1987-04-01), Roeder et al.
patent: 4816919 (1989-03-01), Coates
patent: 4872058 (1989-10-01), Baba et al.
patent: 4985777 (1991-01-01), Kawada
patent: 5164835 (1992-11-01), Yamada et al.

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