Patent
System, method, and program for extracting invisible information
| العنوان: | System, method, and program for extracting invisible information |
|---|---|
| Patent Number: | 7,520,443 |
| تاريخ النشر: | April 21, 2009 |
| Appl. No: | 11/611733 |
| Application Filed: | December 15, 2006 |
| مستخلص: | 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. |
| Inventors: | Kamijoh, Koichi (Yokohama, JP); Kamijoh, Noboru (Fujisawa, JP); Maeda, Junji (Tokyo, JP); Sakamoto, Masaharu (Yokohama, JP) |
| Assignees: | International Business Machines Corporation (Armonk, NY, US) |
| Claim: | 1. A method for extracting invisible information from an object formed by overlapping visible information with a least part of invisible information formed in a stealth ink, comprising: a step of irradiating the object with light for making the stealth ink luminous; a step of receiving reflected light from the object; a step of extracting image information from the received reflected light; a step of storing the image information; a step of splitting the image information into a plurality of color channel information; a step of obtaining a correlation function and broadening pixel values between color channel information on at least one pixel value that forms an image information, for at least two color channel information selected from the color channel information; a step of reducing a visible information component of one selected color channel information using the correlation function, to perform interpolation, raising image information of the stealth ink and reducing non stealth-ink image information; and a step of extracting invisible information from an interpolated one color channel information by the steps of: extracting a position detection pattern; extracting an alignment pattern; correcting distortions with the alignment pattern; digitizing colors of cells; and determining bit information of the cells from the color channel information after alignment. |
| Claim: | 2. The method according to claim 1 , further comprising a step of specifying a region including the invisible information of the selected color channel information. |
| Claim: | 3. The method according to claim 1 , wherein the step of obtaining a correlation function finds a variation in the pixel values and broadens the pixel values of the other correlation channel information relative to the one selected color channel information and determines the correlation function from the variation. |
| Current U.S. Class: | 235/494 |
| Patent References Cited: | 2007/0267500 November 2007 Juds 2002-098505 October 2003 2003296659 October 2003 2006229894 August 2006 |
| Primary Examiner: | Frech, Karl D. |
| Attorney, Agent or Firm: | Shimokaji & Associates Tuchman, Ido |
| رقم الانضمام: | edspgr.07520443 |
| قاعدة البيانات: | USPTO Patent Grants |
| الوصف غير متاح. |