Focus detecting device using correlation

Details Focus detecting device using correlation Focus detecting device using correlation

1987-10-08

1989-10-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

358227, G01J 120, H04N 5232

Patent

active

048719064

ABSTRACT:
A focus detecting device for determining a focused state of a photo taking optical system through a video signal obtained from an image sensor comprises a detecting circuit arranged to detect focused degrees obtained by scanning at a plurality of scanning line parts of an image sensing plane; a correlation determining circuit arranged to determine a correlation between positions on scanning lines at which the focused degrees are detected during the processes of the scanning lines; and a computing circuit arranged to determine a focused state by computing the focused degrees detected from the scanning line parts which are determined to be correlated to each other by the correlation determining circuit.

REFERENCES:
patent: 4317135 (1982-02-01), Pitruzzello
patent: 4414469 (1983-11-01), Ogasawara
patent: 4470676 (1984-09-01), Kinoshita et al.
patent: 4615598 (1986-10-01), Koshiishi
patent: 4672439 (1987-06-01), Florence et al.

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