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:
Jun. 12, 2001
Filed:
Oct. 31, 1997
Shiro Fujihara, Tokyo, JP;
Yasuhiko Okuhara, Tokyo, JP;
Hirotaka Nakano, Tokyo, JP;
Fumihiro Okazaki, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
An encoder, which comprises a means,for embedding a specific electronic mark data in a characteristic part of an image converted to a spatial frequency area, a quantizing means,for quantizing the spatial frequency area data in which the electronic mark data is embedded and a variable length encoder,for variable length coding the quantizer output, outputs compression coded digital image data. A decoder comprises a variable length decoder,and reverse quantizer,for restoring compression encoded digital image data to spatial frequency area data, means,for detecting the electronic mark data from the restored data, and detection display means,for displaying the detection result.