发明名称 |
System, method, and program for extracting invisible information |
摘要 |
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.
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申请公布号 |
US7520443(B2) |
申请公布日期 |
2009.04.21 |
申请号 |
US20060611733 |
申请日期 |
2006.12.15 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
KAMIJOH KOICHI;KAMIJOH NOBORU;MAEDA JUNJI;SAKAMOTO MASAHARU |
分类号 |
G07K19/06 |
主分类号 |
G07K19/06 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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