Visible authentication patterns for printed document
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United States of America Patent
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May 29, 2012
Grant Date -
Mar 15, 2012
app pub date -
Jun 7, 2011
filing date -
May 14, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A technique for determining authenticity of analog forms such as packaging or documents determines whether the analog form has been made directly from a digital representation or by photocopying or scanning an analog form. The technique makes the determination by comparing an original digital representation of a portion of the analog form having an authentication pattern with a digital recording of the portion from the analog form and measuring differences in features that are affected by the operations of photocopying or scanning. The authentication pattern may depend on a key or on other information displayed on the analog form. Another pattern may be displayed on the analog form to locate the pattern.
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