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:
Apr. 27, 2004
Filed:
Sep. 01, 1998
Applicant:
Inventors:
Isao Echizen, Yokohama, JP;
Hiroshi Yoshiura, Tokyo, JP;
Masafumi Nakamura, Yokohama, JP;
Takao Arai, Yokohama, JP;
Toshifumi Takeuchi, Tokyo, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06K 9/00 ; G06K 9/46 ; G06K 9/32 ; H04L 9/00 ;
U.S. Cl.
CPC ...
G06K 9/00 ; G06K 9/46 ; G06K 9/32 ; H04L 9/00 ;
Abstract
A data embedding method and apparatus and a data reproducing method and apparatus are provided which can apply a digital watermark to various contents. Instead of embedding watermarking information in respective pixels or by using a relation between pixels, the watermarking information is embedded as a position pattern of changed pixels in the contents. Reliability comparable with conventional techniques can be obtained irrespective of a change in a smaller number of pixels for the contents.