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:
Oct. 21, 2008
Filed:
Apr. 23, 2004
Toshio Tohne, Gunma, JP;
Takashi Hashimoto, Saitama, JP;
Masahiko Suzaki, Saitama, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
There is provided a watermark information detecting method capable of detecting confidential information accurately from a document including confidential information. In this method, a filtering process is performed on the whole surface of an input image (S), and a position of signal is obtained by using a signal position searching template in order for the sum of filter output value to be maximum (S). Then a signal border is determined (S). Even when the image is expanded or contracted due to displacement of paper, etc., the signal position can be correctly detected and confidential information can be correctly detected from a document including confidential information.