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:
Mar. 16, 2004
Filed:
Apr. 04, 2000
Kazumasa Kita, Yokohama, JP;
Hiroshi Yoshiura, Tokyo, JP;
Yutaka Kurosu, Yokohama, JP;
Miki Tanaka, Yokohama, JP;
Shinobu Eikawa, Yokohama, JP;
Tomoyuki Kaji, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
There is provided a steganographic system which can dispense with an original image during extraction of watermark by determining a position at which an optimum space dependent physical quantity is embedded as a watermark complying with an image such that the picture quality can be prevented from being deteriorated, embedding watermark information in the image, generating information such as watermark embedding position information and receiving a watermark embedded image and watermark embedded position information to extract watermark information.