Automatic focusing apparatus of video camera

Details Automatic focusing apparatus of video camera Automatic focusing apparatus of video camera

1990-07-24

1992-04-21

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358209, 35821319, H04N 5232

Patent

active

051073374

ABSTRACT:
An optical system of a video camera is moved to a plurality of positions having a minute predetermined interval, and detected video images of an object at the respective positions are memorized in a frame memory in turn, the video images are compared with each other, and the video image having the highest contrast is selected, thus the position at which the video image having the highest contrast is detected is recognized as a focused position, and the optical system is shifted to the position.

REFERENCES:
patent: 4484806 (1984-11-01), Onishi et al.
patent: 4523829 (1985-06-01), Eguchi et al.
patent: 4615598 (1986-10-01), Koshiishi
patent: 4638364 (1987-01-01), Hiramatsu
patent: 4967279 (1990-10-01), Murashima

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