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. 26, 2008
Filed:
Sep. 12, 2005
Akiomi Kunisa, Tokyo, JP;
Akiomi Kunisa, Tokyo, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
A digital watermark extracting apparatus that extract a watermark hidden in host data is provided. A location information generator generates a plurality of candidate watermark locations according to a secret key. An extractor extracts from each of the candidate watermark locations a watermark which has been embedded in a watermarked host signal and detects a soft decision value on the extracted watermark. A decision value evaluator evaluates a sum of the absolute values of the components of the each soft value. A selector determines a true watermark location according to the soft decision value evaluated by the decision value evaluator. The selector provides to an ECC decoder the soft decision value on the watermark extracted from the true watermark location. The ECC decoder error-correction decodes the soft decision value on the extracted watermark and outputs watermark information.