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. 21, 2009
Filed:
Dec. 15, 2006
Koichi Kamijoh, Yokohama, JP;
Noboru Kamijoh, Fujisawa, JP;
Junji Maeda, Tokyo, JP;
Masaharu Sakamoto, Yokohama, JP;
Koichi Kamijoh, Yokohama, JP;
Noboru Kamijoh, Fujisawa, JP;
Junji Maeda, Tokyo, JP;
Masaharu Sakamoto, Yokohama, JP;
International Business Machines Corporation, Armonk, NY (US);
Abstract
A method for extracting invisible information from an object in which visible information overlaps with at least part of invisible information formed in stealth ink. The method includes the steps of: irradiating the object with light for making the stealth ink luminous; receiving reflected light from the object; extracting image information from the received reflected light; splitting the image information into a plurality of pieces of color-channel information; obtaining a correlation function between the pixel values of at least two color-channel information selected from the plurality of pieces of color-channel information; reducing a visible information component of selected one of the plurality of pieces of color-channel information to thereby interpolate the color-channel information; and extracting invisible information from the interpolated one piece of color-channel information.