Secure documents with hidden signals, and related methods and systems
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Jun 30, 2009
Grant Date -
Jun 5, 2008
app pub date -
Oct 23, 2007
filing date -
May 8, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A security document comprising artwork including a security pattern, characterized in that the security pattern has the form of a line structure in which lines width or line spacing is adjusted to carry predefined data. The artwork is generated by the modifying at least one color of at least a part of the artwork to embed the security pattern in the artwork. Methods for detecting the security pattern include use of a frequency domain structure to detect the security pattern despite rotation and scaling of the document, use of signal tiling to improve signal detection, and use of statistical analyses to verify detection of the security pattern.
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