Symmetry watermark

Details Symmetry watermark Symmetry watermark

2006-07-04

2006-07-04

Ahmed, Amir (Department: 2623)

Image analysis

Applications

C713S176000, C348S460000, C380S210000

Reexamination Certificate

active

07072490

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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Solachidis et al., “Circularly Symmetric Watermark Embedding in 2-D DFT Domain,” ICASSP'99, Mar., 1999.

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