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:
Sep. 12, 2006
Filed:
Apr. 02, 2002
Koichi Kamijo, Yokohama, JP;
Koichi Kamijo, Yokohama, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
The invention provides methods, apparatus and systems for providing robustness relative to data compression and conversion for additional information embedded into digital content. Before predetermined additional information is embedded into digital content, the state following the embedding of additional information is set for the feature values that are used for the embedding of the additional information, so that the distribution of the feature values obtained following the embedding conforms to a predetermined function. Then, based on the setting contents, the feature values of the digital content are changed. In the information detection process, when the digital content in which the additional information is embedded is compressed, a predetermined distribution of the feature values of the digital content is employed to reproduce the distribution of the digital content feature values in the state preceding the conversion. Based on this reproduced distribution, the additional information embedded into the digital content is detected.