Device for focus detection with weightings of the focus detectin

Details Device for focus detection with weightings of the focus detectin Device for focus detection with weightings of the focus detectin

1989-09-05

1991-02-19

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358166, 2502012, H04N 5232

Patent

active

049949209

ABSTRACT:
A focus detecting device arranged to evaluate the focused state of an object's image by using an image signal obtained from an image sensor comprises: a first detecting circuit which detects the maximum differential value of the image signal; a second detecting circuit which detects the width of an edge part of the object's image; and an evaluation circuit which is arranged to evaluate the focused state of said object's image by suitably combining, according to a focused degree detected, the detection values produced from the first and second detecting circuits.

REFERENCES:
patent: 4544953 (1985-10-01), Goldman
patent: 4609944 (1986-09-01), Nakada et al.
patent: 4717959 (1988-01-01), Isago

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