基于Contourlet變換的數(shù)字水印優(yōu)化嵌入算法與性能分析.pdf

1、南京理工大學(xué)碩士學(xué)位論文基于Contourlet變換的數(shù)字水印優(yōu)化嵌入算法與性能分析姓名：張戈申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：計(jì)算機(jī)應(yīng)用技術(shù)指導(dǎo)教師：肖亮20090601ABSTRACTAtpresent，withtherapiddevelopmentofIntemetandmultimediatechnologies，thesecurityofdigitalproductshasbecometheissuesofparticularconce

2、rnAsabranchoftheInformationhiding，digitalwatermarkingplaysanimportantroleincopyrightprotectionandintegralityauthenticationInthisdissertation，anoverviewofdigitalwatermarkingtechnologyresearchsituationwassummarizedfirstlya

3、ndthebasicframeworkandsystemmodelofdigitalwatermarkingweredescribedindetail，andthenonthebasisofContourlettransformtheoryembeddinganddetectingalgorithmoferasablewatermarkingandrobustwatermarkingwereexploredFinallyalgorith

4、mperformancehasbeenprovedbyexperimentTheprimarycontributionsofthisdissertationcontainthefollowingpoints：ArobustwatermarkingalgorithminContourletdomainbasedoncloudmodelWasproposedbyresearchingonthetheorywhichwasusedforanu

5、ncertaintytransformingbetweenaqualitativeconceptanditsnumericalrepresentationNormalcloudgeneratoralgorithmandsimilarcloudmeasurementalgorithmweretobeextendedtowatermarkinggenerationanddetectionAndaseriesofclouddropletcol

6、lectionwereseenaSembeddedwatermark，therobustnessofwatermarkingalgorithmWasfurtherimprovedbyrandomnessandfuzzinessofcloudwatermarkBaseoncloudexpectationcurve，anovelsimilarcloudmeasurementalgorithmwasbroughtforwardExperime

7、ntalresultsdemonstratethattheproposedalgorithmWasinvisibleandabletoeffectivelyresistattackssuchasJPEGfiltering，noise，croppingandSOonAnoveldualwatermarkingalgorithminContourletdomainWasproposedaccordingtopracticalapplicat

8、ionsItimplementsbothcopyrightprotectionandcopyrightnotificationbyinvisiblerobustwatermarkandvisibleremovablewatermarkThisdissertationsurveyedcompressedsensingtheorywhichisusedforsparsesignalacquisitionandreconstruction，a

9、nditwasaDpliedtothedesignofavisibletranslucentwatermarkalgorithmInthisalgorithm，measuremeutvectorWasembeddedintoContourletapproximationAndtheexperimentalresultsshoWthatthealgorithmnotonlyCanreconstructsub—imagewithhighqu

10、alitybutalsoprovidedsecurityassurancesInordertoexploitembeddingalgorithmofmaskingcharacteristics，HVSmodelWasimprovedinContourletdomainAndpseudorandomsequencewatermarkWasembeddedintoContourletsubbandsBystatisticalproperti