Focus condition detecting device having correlation calculation

Details Focus condition detecting device having correlation calculation Focus condition detecting device having correlation calculation

1986-10-30

1988-03-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354406, G01J 120, G03B 300, G03B 1318

Patent

active

047345713

ABSTRACT:
There is disclosed a focus condition detecting device for a camera.
The focus condition detecting device has a preliminary correlation calculation means for calculating correlations between first and second image signals with a relatively low accuracy and a principal correlation calculation means for calculating correlations between first and second image signals with a relatively high accuracy on the basis of data obtained in the preliminary correlation calculation.

REFERENCES:
patent: 4387975 (1983-06-01), Araki
patent: 4492448 (1985-01-01), Ishikawa et al.
patent: 4523829 (1985-01-01), Eguchi et al.
patent: 4561749 (1985-12-01), Utagawa
patent: 4573784 (1986-03-01), Suzuki
patent: 4636624 (1987-01-01), Ishida et al.
patent: 4647174 (1987-03-01), Tsunekawa et al.
U.S. patent application Ser. No. 735,569, filed May 17, 1985.
U.S. patent application Ser. No. 945,879, filed Dec. 23, 1986.

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