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:
May. 14, 2013
Filed:
May. 21, 2010
Peter Alleine Fletcher, Rozelle, AU;
Stephen James Hardy, West Pymble, AU;
Peter Alleine Fletcher, Rozelle, AU;
Stephen James Hardy, West Pymble, AU;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A method determines displacements between pixels in a captured image of a reference pattern and corresponding pixels in the reference pattern including the steps of capturing the image of the reference pattern having a source pattern modulated by a plurality of carrier frequencies in a corresponding plurality of directions in the source pattern, demodulating at least three of the carrier frequencies in the captured image to form an amplitude image and a wrapped phase image for each of the carrier frequencies, and combining the wrapped phase images weighted by the amplitude images to determine the displacements between pixels in the captured image and corresponding pixels in the reference pattern.