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:
Oct. 25, 2011
Filed:
Nov. 28, 2007
Xu Zeng, Beijing, CN;
Lifeng Xu, Beijing, CN;
Qilin Xiao, Beijing, CN;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A method and apparatus for estimating vanishing points from an image, a computer program and a storage medium thereof are provided. One of the methods for detecting the vanishing points from an image includes a dividing step for dividing the image into small patches, a first detecting step for detecting each patch's local orientations, a composing step for composing lines of pencils from which at least one vanishing point is to be computed based on the local orientations detected in the first detecting step, and a computing step for computing at least one vanishing point based on the lines of pencils composed in the composing step. On the basis of the computed vanishing points, the perspective rectification on a document image can be executed accurately and quickly.