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:
Aug. 10, 2010
Filed:
Sep. 22, 2006
Applicant:
Takahiro Yagishita, Kanagawa, JP;
Inventor:
Takahiro Yagishita, Kanagawa, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N 1/60 (2006.01); H04N 1/40 (2006.01);
U.S. Cl.
CPC ...
Abstract
For detecting tampering made on a paper document, by carrying out image processing on grayscale image data optically read from the paper document, amplifying a predetermined grayscale value on the grayscale image data, and also, reducing the other grayscale values; and detecting whether or not the paper document has been tampered, according to grayscale converted data calculated based on first grayscale image data obtained from reading an obverse side of the paper document and second grayscale image data obtained from reading a reverse side of the paper document.