Method and apparatus for autofocus control using large and small

Details Method and apparatus for autofocus control using large and small Method and apparatus for autofocus control using large and small

1991-02-28

1992-09-22

Razavi, Michael

Facsimile and static presentation processing

Facsimile

Recording apparatus

358226, 358209, 2502017, 354402, H04N 5232

Patent

active

051502178

ABSTRACT:
A video camera system has a movable focusing lens which is automatically focused to form a sharp subject image on a CCD. The CCD generates a video signal based on light from a subject transmitted through the movable focusing lens. Contrast data are produced from smaller and larger image frames in a field on the CCD based on the generated video signal. The movable focusing lens is controlled on the basis of the contrast data in order to maximize the contrast data simultaneously within the smaller and larger image frames.

REFERENCES:
patent: 4542289 (1985-09-01), Yokoyama et al.
patent: 4804831 (1989-02-01), Baba et al.
patent: 4851657 (1989-06-01), Taniguchi et al.
patent: 4922346 (1990-05-01), Hidaka et al.
patent: 5003339 (1991-09-01), Kikuchi et al.

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