Television – Camera – system and detail – Optics
Patent
1995-06-02
1996-11-12
Garber, Wendy
Television
Camera, system and detail
Optics
348349, H04N 5232
Patent
active
055745024
ABSTRACT:
Automatic focusing apparatus for automatically matching focus with respect to an object in response to a video signal obtained from an image sensing device having an adjustable aperture, a lens, and an image sensor which receives incident light through the aperture and lens. The automatic focusing apparatus includes a circuit for integrating a high frequency component of a video signal every field to generate a focus evaluating value; a control unit for adjusting the position of a focusing lens so that the focus evaluating value attains the maximum value; memories for storing focus evaluating values of fields successively supplied from the focus evaluating value generating circuit, and memories for storing data relating to the various positions of the focusing lens which correspond to the focus evaluating values. The automatic focusing apparatus further includes a control device for controlling the speed at which the focusing lens position is adjusted. In one embodiment, the speed at which the lens position is adjusted is controlled as a function of the size the adjustable aperture, e.g., the size of an aperture created by an iris. In accordance with the present invention the speed at which the position of the focusing lens is adjusted is increased as the aperture size is decreased, e.g., by the closing of the iris.
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Garber Wendy
Ho Tuan V.
Michaelson Peter L.
Sanyo Electric Co,. Ltd.
Straub Michael P.
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