一种稳健的基于小波变换的彩色图像数字水印算法（完整版）实用资料(可以直接使用，可编辑完整版实用资料，欢迎下载）IABSTRACTTherevolutionofthedigitalinformationhasbroughtbigchangesinourlivesandoursociety.Thedigitalinformationhasalsogeneratednewchallengesandnewopportunitiesforinnovation.Thisthesisdiscussestheissuesregardinginformationhidinginthedigitalimageanditsapplicationforsecurethedigitalmultimedia,addressingboththeoreticalandpracticalaspectsandtackingbothdesignandattackproblems.Inthefundamentalpart,wediscussthekeyelementsofwatermarkinganditsapplicationindigitalimage.Inthedesignpart,wepresentnewinformationhidingalgorithmfordigitalcolorimage.Thedesignprovidesconcreteexamplesregardingthechoiceofembeddingandextractionmechanisms.Withthegrowthofnetworkedmultimediasystems,theneedofsecurecommunicationanddatatransfergoincreasingly.Applicationsarenumerousandvariouslikesatelliteormedicalimagery,orremotemonitoring.Duringimagestransfer,dataintegrityisnotreallysecure.Watermarkingcanbeananswertosuchproblems.Inthispaper,Arobustwavelet-basedcolorimagedigitalwatermarkingschemeisproposed.TheproposeddigitalwatermarkisarandomrealnumberofasequenceofbitsembeddingintolowfrequencyofGreencomponentsub-band.TheembeddingmethodisbasedonthreelevelsDiscreteWaveletTransform(DWTlowcoefficient.AthresholdisusedtogeneratefrequencyofwatermarkswiththecompareofcreatedfrequencyofDWTinembeddingposition.ExperimentalresultsshowedthattheembeddedwatermarkisrobustagainstvarioussignalprocessingandcompressionattackssuchasSalt&peppernoiseaddition,Cropping,Scaling,JPEGcompression,Meanfiltering,Copyingandpastingandsoon.Keywords:Digitalwatermarking,wavelettransform,Colorimage,Greencomponent,LowfrequencyandRobustness,informationhiding.3ListofFiguresFigure2.10.1Schematicdescriptionofsteganography………………………………..5Figure:2.2Communicationchannelforcryptosystem…………………………………7Figure2.3MonogramsfiguringTGERG……………………………………………….8Figure2.4Genericdigitalwatermarkingscheme………………………………………11Figure2.5Genericdigitalwatermarkingdecoder……………………………………..11Figure2.6Genericdigitalwaterma