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:
Dec. 30, 2008
Filed:
Mar. 25, 2004
Wataru Asano, Yokohama, JP;
Tomoo Yamakage, Yokohama, JP;
Shinichiro Koto, Machida, JP;
Nakaba Kogure, Zama, JP;
Wataru Asano, Yokohama, JP;
Tomoo Yamakage, Yokohama, JP;
Shinichiro Koto, Machida, JP;
Nakaba Kogure, Zama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
An image size reduction unit reduces the image size of an input image signal, thereby generating a size-reduced image signal. A specific frequency component extraction unit extracts a specific frequency component signal from the size-reduced image signal. A phase controller controls the phase of the specific frequency component signal. A correlator computes a cross-correlation value between the phase-controlled specific frequency component signal and size-reduced image signal. A watermark information estimation unit estimates, from the cross-correlation value, watermark information embedded in the input image signal.