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. 03, 2009
Filed:
May. 10, 2004
Yasuhiro Fujii, Fujisawa, JP;
Kazunori Nakano, Fuji, JP;
Isao Echizen, Yokohama, JP;
Hiroshi Yoshiura, Tokyo, JP;
Yasuhiro Fujii, Fujisawa, JP;
Kazunori Nakano, Fuji, JP;
Isao Echizen, Yokohama, JP;
Hiroshi Yoshiura, Tokyo, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A technology of digital watermarking for binary images (including documents) is provided, which is capable of adjusting the amount of information to be embedded while avoiding the deterioration of image quality as far as possible. The watermark information is inserted by giving the standard for judgment of modification and the order of preference for modification according to the characteristic properties of the human visual sense for binary images and performing modification on pixels sequentially in the descending order of preference.