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1、天津工业大学本科毕业论文外文资料InformationHidingThieoreticResearchBasedonDigitalWatermarkTechnologySchoolofMathematicsandComputerScienceNingxiaUniversitYinchuan,ChinaAbstract-Withrapidlygrowinginterestinwaystohideinformation,alargenumberofschemeshavebeenproposedfora
2、udioandothermultimediaindigitalpictures,video,audioandothermultimediaobjects.Inanattempttoovercomethisproblem,watermarkinghasbeensuggestedintheliterratureasthemosteffectivemeansforcopyrightprotectionandauthentication.Themainfocusofthisthesisistheprobl
3、emofwatermarkingandcompressionofimageduetobandwidthorstorageconstraints.Keywords:informationhiding;digitalwatermarking;transparency;robustnessI.IntroductionDuetotherapidlydevelopmentoftheInterestandtheWorld-Wide-Web(WWW),distributionofdigitalmultimedi
4、adatatoalargepopulationofuserscanbedoneveryeasily.Moreover,digitaldatacanbeduplicatedveryfastandwithoutanydegrationinquality-cinsider,forexample,howcommonthecopyingofmusicalCDshasbecomeinthelastfewyears.Naturally,thissituationhasraisedmanyconcernsabou
5、tpossibleviolationsofintellectualpropertyrights.Unauthorizedduplicationanddistributionofcopyrightedmaterial(photographs,music,movies,etc.),withoutappropriatecompensationtothecopyrightholders,arebecomingincreasinglyproblemtic.Inordertofightpiracy,manyc
6、ompanies(especiallyintheentertainmentandnewsindustries)havedevotedconsiderableattentiontothedevelopmentofinformationhiding(orwatermarking)techniques.Inplainterms,awatermarkisasignalwhichishideninsidesomemultimediadata,andcarriesinformationaboutthisdat
7、a(e.g.,owner,title,dataofcreation,ect).Thusawatermarkuniquelyidentifiestheworkbeingprotected,andhelpsresolvedisputesabouttheownershipofthedata.Therehavebeenmanyinstancesofdisputesorlitigationsontheintellectualownershipofmultimediadata.Acopyrightviolat
8、ionslawsuitthatreceivedextensivepublicityintheearly2000's,wasthatagainstNapster.AndtheDigitalVideoDisk,alsoknownasDigitalVersatileDisk(DVD)consortiumcalledforproposalsforacopyrightmarkingschemetoenforceserialcopymanagement.TheideaisthattheDVDp
