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. 29, 1991
Filed:
Mar. 19, 1990
Kalyan V Krishnan, Fremont, CA (US);
Teknekron Transportation Systems, Inc., Berkeley, CA (US);
Abstract
A system for finding and reading a bar code, arbitrarily located on a document, working from an electronic image of the document represented by a pixel array such as generated by a document scanner. A one-dimensional texture analysis is performed in the scanning direction by defining a pattern of test segments and searching for characteristic ranges of transistions within those test segments. If a horizontal test segment pattern fails to locate a bar code region, a test segment pattern skewed with respect to the horizontal is applied. If test patterns skewed with respect to the horizontal fail to locate a bar code region, then a state-transition analysis is applied in the direction perpendicular to the scan direction and in directions skewed with respect to that perpendicular to search for a terminal symbol characterizing the bar code.