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1、HindawiPublishingCorporationEURASIPJournalonInformationSecurityVolume2010,ArticleID134546,19pagesdoi:10.1155/2010/134546ReviewArticleReversibleWatermarkingTechniques:AnOverviewandaClassificationRobertoCaldelli,FrancescoFilippini,andRudyBecarelliMICC,UniversityofFlorence,VialeMorgagni65,50134Florenc
2、e,ItalyCorrespondenceshouldbeaddressedtoRobertoCaldelli,roberto.caldelli@unifi.itReceived23December2009;Accepted17May2010AcademicEditor:JiwuW.HuangCopyright©2010RobertoCaldellietal.ThisisanopenaccessarticledistributedundertheCreativeCommonsAttributionLicense,whichpermitsunrestricteduse,distribution
3、,andreproductioninanymedium,providedtheoriginalworkisproperlycited.Anoverviewofreversiblewatermarkingtechniquesappearedinliteratureduringthelastfiveyearsapproximatelyispresentedinthispaper.Inadditiontothisageneralclassificationofalgorithmsonthebasisoftheircharacteristicsandoftheembeddingdomainisgive
4、ninordertoprovideastructuredpresentationsimplyaccessibleforaninterestedreader.Algorithmsaresetinacategoryanddiscussedtryingtosupplythemaininformationregardingembeddinganddecodingprocedures.Basicconsiderationsonachievedresultsaremadeaswell.1.Introductionwrongboth,firstly,tosafeguardthepatient’shealt
5、hand,secondly,toprotecttheworkoftheradiologisthimself.DigitalwatermarkingtechniqueshavebeenindicatedsofarInsuchcases,irreversiblewatermarkingalgorithmsclearlyasapossiblesolutionwhen,inaspecificapplicationscenarioappearnottobefeasible;duetothisstrictrequirement,(authentication,copyrightprotection,fin
6、gerprinting,etc.),anothercategoryofwatermarkingtechniqueshavebeenthereistheneedtoembedaninformativemessageinaintroducedinliteraturewhicharecataloguedasreversible,digitaldocumentinanimperceptibleway.Suchagoalwhere,withthisterm,itistobeintendedthattheoriginalisbasicallyachievedbyperformingaslightmod
7、ificationcontent,otherthanthewatermarksignal,isrecoveredfromtotheoriginaldatatryingto,atthesametime,satisfythewatermarkeddocumentsuchthatanyevaluationcanotherbindingssuchascapacityandrobustness.Whatisbeperformedon
