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:
Apr. 28, 2009
Filed:
Oct. 18, 2005
Applicants:
Hiroshi Hayakawa, Saitamai, JP;
Susumu Nakano, Hamura, JP;
Kentaro Takahashi, Tokoroza, JP;
Inventors:
Assignee:
Optoelectronics Co., Ltd., Warabi, Saitama Pref., JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06K 9/18 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method for processing a digital signal obtained in a barcode reading operation comprises a step of applying a wavelet transformation to the digital signal. The noise threshold at each level of the wavelet transformation is determined from a total transfer function in the analogue processing stage, and the coefficients are set to be zero if less than the noise threshold.