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:
Feb. 28, 2006
Filed:
Sep. 11, 2001
Masaaki Taniguchi, Yamato, JP;
Shuhichi Shimizu, Yokohama, JP;
Kohichi Kamijoh, Yokohama, JP;
Ryoh Sugihara, Yamato, JP;
Masaaki Taniguchi, Yamato, JP;
Shuhichi Shimizu, Yokohama, JP;
Kohichi Kamijoh, Yokohama, JP;
Ryoh Sugihara, Yamato, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
The present invention provides methods, apparatus and systems for embedding and detecting an electronic watermark without requiring signals for geometric compensation. A particular embodiment uses a periodic pattern with repetition as an embedded pattern itself, which has information embedded as an electronic watermark, and observes the change of its period upon detection to calculate the scaling factor. When detecting the electronic watermark, the scaling factor of images is calculated from digital data that underwent the scaling processing, and then the processing to detect the electronic watermark is performed based on the obtained scaling factor.