Automatic focusing apparatus for automatically matching focus in

Details Automatic focusing apparatus for automatically matching focus in Automatic focusing apparatus for automatically matching focus in

1993-12-28

1994-11-01

Razavi, Michael T.

Television

Camera, system and detail

Optics

348352, 348353, H04N 5232

Patent

active

053610954

ABSTRACT:
An automatic focusing apparatus of a video camera automatically matches a focus in response to a video signal obtained from an image sensing circuit. The automatic focusing apparatus detects the level of a high frequency component of the video signal in order to supply a focus evaluating value which takes a maximum value in an in-focus position. A focusing motor controlling circuit performs an automatic focusing operation by a hill-climbing servo system based on the supplied focus evaluating value. A determination is made by employing a fuzzy inference with respect to the initialization of the direction of movement of a lens when the automatic focusing operation starts, the selection of a focusing area from a plurality of areas, and the reactivation of the automatic focusing operation due to a change of an object once the automatic focusing operation is completed.

REFERENCES:
patent: 5083150 (1992-01-01), Nagasaki et al.
patent: 5084254 (1992-01-01), Tomitaka
patent: 5223921 (1993-06-01), Harugi et al.

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