The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 09, 1993
Filed:
Jun. 28, 1991
Akihiro Kikuchi, Chiba, JP;
Tokuya Fukuda, Tokyo, JP;
Sony Corporation, Tokyo, JP;
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.