Printed product, printed product detection method and detection apparatus, and authentication method and authentication apparatus
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United States of America Patent
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Nov 8, 2011
Grant Date -
May 21, 2009
app pub date -
Mar 28, 2006
filing date -
Mar 30, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
This invention implements a printed product capable of embedding a variety of information which are unrecognizable by human eyes in image lines included in a security line drawing without decreasing the artistic effect of printed image lines and authenticating the information on the basis of the Fourier-transformed pattern of the printed image lines. This invention provides an information authenticable printed product having a plurality of line drawings in which an image line includes a unit image line including a plurality of image lines arrayed in parallel along a normal direction, and the normal-direction intervals between the plurality of image lines in the unit image line are set in correspondence with information to be embedded, an authentication method, a method of embedding information in the printed product, and an authentication apparatus.
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