Focus detection apparatus

Details Focus detection apparatus Focus detection apparatus

1991-09-03

1993-04-13

Gellner, Michael L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358227, G03B 1300

Patent

active

052027180

ABSTRACT:
A focus detection apparatus includes two photoelectric conversion units for outputting electrical signals corresponding to light receiving amounts, an optical unit for splitting an object image into two images to cause the two images to be respectively focused on the two photoelectric conversion unit, and a judging unit for judging on the basis of the electrical signals from the photoelectric conversion unit whether or not the object image has a periodic contrast pattern.

REFERENCES:
patent: 4561749 (1985-12-01), Ugagawa
patent: 4851657 (1989-07-01), Taniguchi et al.
patent: 4859842 (1989-08-01), Suda et al.

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