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:
Jun. 25, 2013
Filed:
May. 26, 2009
LI Hong, San Diego, CA (US);
Li Hong, San Diego, CA (US);
Nikon Corporation, Tokyo, JP;
Abstract
A method for estimating whether an image () is either blurred or sharp includes the steps of (i) determining an image gradient histogram distrbution () of at least a portion of the image (), (ii) comparing at least a portion of the image gradient histogram distribution () to a Gaussian model (), and (iii) estimating a defocus blur size of at least a portion of the image () Additional methods for evaluating whether the image () has motion blur are provided herein For example, a dominant gradient orientation can be detected by histogram analysis (), and the dominant gradient orientation () can be used to determine a possible motion blur direction () Alternatively, a dominant gradient orientation can be detected using principal component analysis ('PCA') on the image.