Focus detector with characteristic point detection

Details Focus detector with characteristic point detection Focus detector with characteristic point detection

1982-10-01

1985-07-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, 354405, G01J 120

Patent

active

045324204

ABSTRACT:
A focus detector of image correlation type projects an image of an object onto a first and a second array of photoelectric transducer elements. Each of the transducer elements produces an output in accordance with the distribution of light intensity of image incident thereon. A characteristic point is retrieved from the distribution of outputs from the first array, and a corresponding characteristic point is retrieved from the distribution of outputs from the second array which corresponds to the first mentioned characteristic point. An in-focus condition is detected on the basis of the relative position between those transducer elements which produce outputs for these characteristic points.

REFERENCES:
patent: 4217043 (1980-08-01), Momose et al.
patent: 4255028 (1981-03-01), Aoki
patent: 4305657 (1981-12-01), Masunaga et al.
patent: 4319813 (1982-03-01), Aoki et al.
patent: 4394569 (1983-07-01), Nakamura

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