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. 20, 2007
Filed:
Dec. 26, 2002
Adam Wagman, Framingham, MA (US);
Sateesh G. Nadabar, Framingham, MA (US);
Jason Davis, Bellingham, MA (US);
Adam Wagman, Framingham, MA (US);
Sateesh G. Nadabar, Framingham, MA (US);
Jason Davis, Bellingham, MA (US);
Cognex Technology and Investment Corporation, Mt. View, CA (US);
Abstract
A search method is disclosed for finding bar code symbols and various two-dimensional symbols, regardless of orientation, that is efficient, robust, and easy to use. The method works well on cluttered backgrounds, on skewed symbols, when symbols are almost touching, and when symbols are adjacent to text. The method includes choosing a candidate start region in the image, and then determining whether the candidate start region includes at least a portion of a candidate oriented encoded signal. Next, an approximate orientation of the candidate oriented encoded signal is determined. Then, the candidate start region is grown, using the approximate orientation, so as to form a candidate symbol region that encloses an entire candidate code symbol, including at least a portion of the candidate start region. The method is finely responsive to orientation.