METHOD FOR EMBEDDING DATA IN PRINT MEDIUM, METHOD FOR RETRIEVING DATA EMBEDDED IN PRINT MEDIUM, PRINTER HAVING FUNCTION FOR EMBEDDING DATA IN PRINT MEDIUM, APPARATUS READABLE MEDIUM INCLUDING INSTRUCTION PROGRAM FOR APPARATUS TO EXECUTE THE METHOD FOR EMBEDDING DATA IN PRINT MEDIUM, AND APPARATUS READABLE MEDIUM INCLUDING INSTRUCTION PROGRAM FOR APPARATUS TO EXECUTE THE METHOD FOR RETRIEVING DATA EMBEDDED IN PRINT MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a data embedding scheme for a duplex color laser printer. SOLUTION: The present invention relates to 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". COPYRIGHT: (C)2006,JPO&NCIPI