基于Contourlet變換的數(shù)字圖像盲水印技術研究.pdf

1、蘇州大學碩士學位論文基于Contourlet變換的數(shù)字圖像盲水印技術研究姓名：魏晶晶申請學位級別：碩士專業(yè)：計算機應用技術指導教師：馬小虎201104AbstractResearchonBlindWatermarkingTechniqueofDigitalImagesBasedOilContourletTransformResearchonBlindWatermarkingTechniqueofDigitalImagesBasedonC

2、ontourletTransformAbstractWiththedevelopmentofmultimediatechnologyandthepopularizationoftheInternet，thedigitalproductsareusedmorewidelythanbeforeThewaysofhowtelease，acquire，andchangeinformationaremoreandmoresimpleandvari

3、edAsakindofimportantmeansinthedomainofcopyrightprotection，digitalwatermarkingtechnologybecomesahotspotintheacademicfieldInthisthesis，wedoalotofresearchondigitalwatermarkingbasedonContourletdomainThemainworksofthispaperar

4、easfollows：1Firstofall，weintroducethebackgroundsignificancehistoryanddevelopmentofthedigitalwatermarkingbothathomeandabroadThenanalyzethedigitalwatermarkingtechnologyandContourlettransformationtheory2Ablinddigitalwaterma

5、rkingalgorithmisproposedbasedontheanalysisofcharacteristicofContourletdomaininthisthesisFirstlyperfromContourlettransformonthehostimage，choosingthelowfrequencysubbandastheembeddingdomain；thenfindthepositionofdigitalwater

6、markingintheembeddingdomaincombiningwith2DlinearmappingAtlast，embeddigitalwatermarkingtothehostimagewiththemethodofparityquantitative3CombiningwiththecharacterofContourlet，analgorithmofquantitativeisproposedinthisthesisW

7、efirstcomputethethresholdofHVS(HumanVisualSystem)andperformContourlettransformtothehostimage，dividingthetransformedhostimageaccordingtothesizeofdigitalwatermarkingThenchoosethesub—blocktoembedwatermarkcombinedwithHVSThed