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. 04, 1994
Filed:
Aug. 26, 1991
Applicant:
Inventor:
Yuji Ishikawa, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ; H04N / ;
U.S. Cl.
CPC ...
3582613 ; 3582612 ;
Abstract
A decoding device for two-dimensional codes employs a first serial reference line signal which assumes the value '1' only at the change point from black to white, and a second reference line signal which assumes the value '1' only at the change point from white to black, either of which is selected according to the color of the start pixel. The end of a reference line can be identified by the value '1' in both reference line signals. The decoding device can thus achieve high-speed development of two-dimensional codes without a large-scale logic circuit.