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:
Jul. 01, 2008
Filed:
Oct. 21, 2004
Applicant:
Jau-yuen Chen, Palo Alto, CA (US);
Inventor:
Jau-Yuen Chen, Palo Alto, CA (US);
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06K 15/00 (2006.01); G06K 9/00 (2006.01); H04N 1/40 (2006.01);
U.S. Cl.
CPC ...
Abstract
A data embedding technique that adds a watermark in the form of embedded data in the RGB domain in a duplex color laser printer. The data embedding algorithm employs a two-color (cyan and magenta) patch based coding scheme. Each bit of raw data is coded by a rectangular patch ('data area') of either cyan or magenta color surrounded by white space ('space area'). The combination of a single data area and corresponding space area is a “data cell”.