In-focus detection apparatus using video signal

Details In-focus detection apparatus using video signal In-focus detection apparatus using video signal

1992-02-27

1993-07-06

Ben, Loha

Optical: systems and elements

Lens

With support

2502012, 2502017, 358227, G02B 702

Patent

active

052259404

ABSTRACT:
An in-focus detection apparatus used for a video camera includes edge width detector for detecting a plurality of edge widths of an object, and an calculation device for calculating the amount of driving a lens based on the distribution state of these plurality of edge width data. The apparatus uses a video signal and provides the in-focus state of an actual object with a high accuracy without requiring slight movement of a focusing lens.

REFERENCES:
patent: 4762986 (1988-08-01), Suda et al.
patent: 4804831 (1989-02-01), Baba et al.
patent: 4904854 (1990-02-01), Ishide et al.
patent: 4994920 (1991-02-01), Fujiwara et al.
patent: 5055665 (1992-10-01), Baba et al.

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