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:
Aug. 03, 2004
Filed:
Aug. 12, 1999
Applicant:
Inventor:
Kenneth L. Oakeson, Boise, ID (US);
Assignee:
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G06K 9/36 ;
U.S. Cl.
CPC ...
G06K 9/36 ;
Abstract
A document processing system for imperceptibly encoding information in displayed images or text. Printed text or other images are modified using gray levels to encode information within existing text or images. The text is modified using digital processing to provide text or images in which adjacent portions of individual text characters, for example, have slightly different gray levels in accordance with an encoding scheme to encode addition information within the existing text. The modifications to the text is so slight that it is imperceptible to the human eye, yet is easily detectable by a machine such as a scanner.