Symmetry watermark
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United States of America Patent
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Jul 4, 2006
Grant Date -
May 27, 2004
app pub date -
Nov 22, 2002
filing date -
Nov 22, 2002
priority date (Note) -
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Abstract
A digital watermark is generated with radial and circumferential symmetries in a particular domain of a host signal into which it is embedded. These symmetries enable a detector to compute the projective transformation and rotation angle of the embedded signal using only the symmetry properties. The embedded signal may be variable, such as being modulated with a variable message payload, yet the scale and rotation of this variable signal is detectable based on its symmetry properties.
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