Embedding data in material

Details Embedding data in material Embedding data in material

2007-04-10

2007-04-10

Ahmed, Samir (Department: 2624)

Image analysis

Applications

C713S176000

Reexamination Certificate

active

11103005

ABSTRACT:
A method of embedding data in material comprises the steps of:embedding data in original material to produce data embedded material;removing the watermark from the data embedded material to produce recovered material;comparing the original and recovered material to determine the differences and locations of differences therebetween; andstoring the said locations and corrections which correct the said differences.A method of removing the data embedded in the material, comprises the steps of:removing the data from the material to produce recovered material;deriving the said corrections and locations from the said store; andusing the corrections to correct the recovered material at the said locations.A method of embedding data in material, preferably comprises the steps of:producing transform coefficients Ci representing a spatial frequency transform of the material, andcombining the coefficients Ci with the data bits Ri to produce a modified coefficient Ci′ wherein-line-formulae description="In-line Formulae" end="lead"?Ci′=Ci+αi Riin-line-formulae description="In-line Formulae" end="tail"?the method further comprising determining αi for each unmodified coefficient Ci as a function F{Cn}iof a predetermined set {Cn}iof transform coefficients Cn which set excludes the coefficient Ci.

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