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:
May. 16, 2006
Filed:
Jan. 18, 2001
Kohichi Kamijoh, Yokohama, JP;
Norishiqe Morimoto, Tokyo, JP;
Satoko Tonegawa, Yamato, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
It is one object of the present invention to prevent embedded verification information from being lost even when a quantization process is performed after verification information has been embedded. A pre-embedding portionconverts a image data value so that quantized values not changing by error introduced through the embedding process. A hash value calculatorcalculates a hash value using image data and key information, and a hash value embedding portionembeds the hash value in the image data. An output format converterquantizes the image data in which the hash value is embedded, and generates JPEG data.