Focusing apparatus and digital filters for use therewith

Details Focusing apparatus and digital filters for use therewith Focusing apparatus and digital filters for use therewith

1991-06-28

1993-02-09

Lall, Parshotam S.

Boots, shoes, and leggings

364575, G06F 1520

Patent

active

051857073

ABSTRACT:
A lens focusing system in which predetermined signal components in a video signal are detected for focusing an image by maximizing the predetermined signal components, includes a lens for focusing an image on an image pickup device operative to convert light from the lens into electric signals; a signal processing circuit for processing the output electric signals from the image pickup device to obtain video signals; a filter which has a transfer characteristic approximating that of a lens system which is out of focus; and a subtracting circuit for eliminating video signal components which pass through the filter from the electric signals output by the image pickup device. Novel digital filters particularly adapted for use with such lens focusing systems also are provided.

REFERENCES:
patent: 4305133 (1981-12-01), Amada et al.
patent: 4521867 (1985-06-01), Kasuga
patent: 4569030 (1986-02-01), Butterweck et al.
patent: 4721851 (1988-01-01), Kogure
patent: 4984187 (1991-01-01), Graybill et al.

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