Image analysis – Applications
Reexamination Certificate
2005-07-12
2011-11-01
Bali, Vikkram (Department: 2624)
Image analysis
Applications
C375S213000, C704S231000
Reexamination Certificate
active
08050446
ABSTRACT:
Disclosed is a method and system for digital watermarking of multimedia signals. The input multimedia signal is represented using an inverse difference pyramid decomposition. Spectrum coefficients may be calculated for each level of the pyramid using a new kind of complex Hadamard transform, the matrix of which is distinguished from the known ones by the fact that only one-fourth of its coefficients are complex numbers. The phases of a previously selected part of the low-frequency coefficients are modified with the watermark data, limiting the angles of the phase changes in a gap of several degrees only. After an inverse complex Hadamard Transform, the values of the coefficients from all pyramid levels are summed up and the result is the watermarked signal. The watermark can contain multiple independent levels for each level of the pyramid.
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Ford, Jr. Charles Wesley
Kountchev Roumen Kirilov
Kountcheva Roumiana Atanassova
Milanova Mariofanna Geourgieva
Todorov Vladimir Todorov
Bali Vikkram
Dougherty J. Charles
Fujita Katrina
The Board of Trustees of the University of Arkansas
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