Automatic focus controlling method

Details Automatic focus controlling method Automatic focus controlling method

1981-03-18

1983-12-20

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

354402, H04N 538

Patent

active

044220979

ABSTRACT:
In a hill-climbing method for detecting a peak of a contrast signal to detect the position to bring a taking lens to for automatic focus control, the taking lens is moved further from a first detected peak position by a predetermined distance for searching for a higher peak. When no higher peak is detected, the lens is brought to the first detected peak position. When a higher level is detected, the lens is further moved for searching another peak according to the hill-climbing method.

REFERENCES:
patent: 3211831 (1965-10-01), Steiner
patent: 3621136 (1971-11-01), Stanwood
patent: 3699251 (1972-10-01), McKechnie
patent: 3932733 (1976-01-01), Olsen
patent: 3967056 (1976-06-01), Yata
patent: 4173402 (1979-11-01), Horike

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