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:
Jul. 10, 2001
Filed:
Jan. 21, 1999
Applicant:
Inventor:
Yutaka Wakasu, Tokyo, JP;
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06K 9/00 ;
U.S. Cl.
CPC ...
G06K 9/00 ;
Abstract
An image is divided into blocks, and different electronic watermark data are embedded into every block using a DCT transformer (,), electronic watermark data inserter (,), and IDCT transformer (,). At that time, reference is made to an electronic watermark data insertion position table (,) and electronic watermark data table (,) which specify that which electronic watermark data is to be inserted into which block of the image.