Image analysis – Applications
Reexamination Certificate
2007-10-23
2009-06-30
Johns, Andrew W (Department: 2624)
Image analysis
Applications
C382S135000
Reexamination Certificate
active
07555139
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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Rhoads Geoffrey B.
Rodriguez Tony F.
Digimarc Corporation
Johns Andrew W
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