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

1990-05-15

1991-12-03

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358209, 358225, H04N 5232

Patent

active

050704087

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: 4544953 (1985-10-01), Goldman
patent: 4833541 (1989-05-01), Takuma et al.
patent: 4903134 (1990-02-01), Murashima et al.
patent: 4967279 (1990-10-01), Murashima
patent: 4967280 (1990-10-01), Takuma et al.
patent: 4975726 (1990-12-01), Kuga et al.

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