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. 12, 2013
Filed:
Feb. 18, 2010
Applicant:
Ju Jin, Austin, TX (US);
Inventor:
Ju Jin, Austin, TX (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 13/16 (2006.01); H04N 5/225 (2006.01);
U.S. Cl.
CPC ...
Abstract
An auto focus method for passive auto focus systems consists of an image acquisition and processing engine, as well as an acutance index calculation engine. An auto focus method measures image's acutance index rather than image's contrast value. A passive auto focus system employing the auto focus method of the present invention can accurately and reliably detect the best focus point and thus preventing auto focus malfunction even under the condition that illumination uniformity changes dramatically.