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1、ABlindImageWatermarkingAlgorithmBasedonDualTreeComplexWaveletTransformS.Mabtoul,E.Ibn-Elhaj,D.AboutajdinesuperiorresultsforimageprocessingapplicationscomparedAbstract—ThispaperpresentsawatermarkingprocedurefordigitalimageintheComplexWaveletDomain.First,atotheDWT[5,6].watermarkimageascopyrightsignisp
2、reprocessedwithaIntheproposedscheme,weappliedtheDualTreerandomlocationmatrix.TheoriginalimageistransformedinComplexWaveletTransform;thewatermarkimageisthecomplexwaveletdomainbyusingDT-CWT,then,preprocessedwitharandommatrix,adaptivelyspreadaccordingtothecharacteristicsoftheimagedata,thepreprocessedwa
3、termarkimageisadaptivelyspreadspectrumspectrum[7]andaddedintothehostimageDT-CWTandaddedintothehostimageDT-CWTcoefficients.Thecoefficients.proposedwatermarkalgorithmneedstwokeys:arandomlocationmatrixensuresthesecurityofwatermarkingII.THEPROPOSEDMETHODprocedureandspreadspectrumwatermarksequenceguarant
4、eesitsrobustness.SimulationresultsdemonstratetheA.Watermarkimagedisorderpreprocessingrobustnessofourimagewatermarkingprocedure,especiallyThefirststepconsiststochangethewatermarkimageW,underthetypicalattacksofgeometricoperations.whichisabinaryimage{-1,1},intoapseudorandomdmatrixWbyusingthefollowingeq
5、uation:I.INTRODUCTIONMultimediawatermarkingtechnologyhasevolvedveryK:WÎWd,Wd(K(i,j))=W(i,j);i,j∈N(1)quicklyduringthelastfewyears.AdigitalwatermarkisinformationthatisimperceptiblyandrobustlyembeddedWhereKpresentthefirstkeyinourwatermarkprocedure,inthehostdatasuchthatitcannotberemoved[1,2].whichisanex
6、clusivekeytorecreatethewatermarkimage.ThereareseveralwatermarkingalgorithmstransformtheFigure1visualizesanexampleofwatermarkimagedisorder.originalimageintocriticallysampleddomain(TheDiscreteRealWaveletTransform(DWT),theDiscreteCosineTransform(DCT)ortheDiscreteFourierTransform(DFT)),andaddarandomsequ
7、encetothetransformedimagecoefficients[3,4].Ingeneral,theDWTproduceswatermarkimageswiththebestvisualqualityduetotheabsenceofblockingartifacts.However,ithastwodrawbacks:OriginalwatermarkimageDisorderwat
