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:
Jan. 26, 2016
Filed:
Feb. 06, 2012
Applicant:
Zehang Sun, Cupertino, CA (US);
Inventor:
Zehang Sun, Cupertino, CA (US);
Assignee:
Apple Inc., Cupertino, CA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N 5/228 (2006.01); G06K 9/32 (2006.01); G06K 9/46 (2006.01); G06T 7/00 (2006.01);
U.S. Cl.
CPC ...
G06K 9/3275 (2013.01); G06K 9/4604 (2013.01); G06T 7/0085 (2013.01); G06T 2207/20061 (2013.01); G06T 2207/20136 (2013.01);
Abstract
An efficient line detection technique pre-processes an image to remove edge pixels that are not on straight lines, before performing line detection. By removing edge pixels not on straight lines, the complexity of the task of line detection can be significantly reduced, while increasing the accuracy. Various embodiments preprocess the edge maps of an image by anisotropic line filtering, kernel density estimation-based edge pruning, and connected component analysis. The resulting pruned edge map may then be processed using a Hough transform to detect straight lines in the image, having removed much of the noise in the edge map.