Bar code candidate select circuit
Barcode width measurement system
Method and apparatus for identification of objects
Method for checking patterns and apparatus to carry out such method
Image scanning process and unit for detecting set forms
Selective code reader Patent #: 4704519
ApplicationNo. 496167 filed on 03/19/1990
US Classes:235/462.08, Bar code location or selection235/494Particular code pattern
ExaminersPrimary: Pitts, Harold I.
Attorney, Agent or Firm
International ClassG06K 007/10
AbstractA 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.
Field of SearchParticular code pattern