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1、ReversibleDataHidingBasedonHistogram112Wen-ChungKuo,Dong-JinJiang,andYu-ChihHuang1DepartmentofComputerScienceandInformationEngineering,NationalFormosaUniversity,Taiwan,R.O.C2DepartmentofInformationManagementTaiwanUniversityofTechnology,Tainan,R.O.C.simonkuo@nfu.edu.twAbs
2、tract.Recently,thereversibledatahidingtechnologyhasbeendiscussedextensively.Itsmajorcharacteristicisthatallowsanoriginalimagetobecompletelyreconstructedfromthestego-imageaftertheextractionoftheembeddeddata.2006,thereversibledatahidingbasedonhistogramisproposedbyNi,etal.(
3、NSAS).However,theembeddeddatacannotberecoveredunlesstheknowledgeofpeakpointisknowntothereceiverinNSAS.Morerecently,Hwang,etal.(HKC)proposedarobustreversibledatahidingschemebasedonhistogramshiftingmethodtoimprovethisshortcoming.Atthesametime,theyalsodiscusswhentheelemento
4、fselectedminimumpointisnotzeroandthengivethesolutiontothisproblem.Unfortunately,theproposedsolutionwilldecreasetheoriginaldatahidingcapacity.Inordertoenhancethedatahidingcapacityandkeepthegoalofreversibledata,weuseonebittorecordthechangeoftheselectedminimumpointtoreplace
5、themethodusingin[6].Accordingtoourproposedmethodandexperienceanalysis,thisreversibledatahidingschemeisnotonlytoimprovetheoriginaldatahidingcapacitybutalsotoreachthegoalofdatarecovering.Keywords:Reversibledatahide,Histogram.1IntroductionNowadays,therapidgrowthofcomputeran
6、dnetworktechnologiespromotesthedigitalmultimediatransmissionovertheInternetincreasingdaybyday.However,thesedigitalmessagesoverInternetstillhavetofacesomeproblems,suchasdatasecurity,copyright,rightmanagement,etc.Usually,therearetwomethodsusedtoenhancetheirsecurity,oneisth
7、ewell-knowmethod,cryptographyandtheotherissteganography.Incryptography,theonlyuserwiththeprivatekeycanrecovertheencryptionmessagewhentheencryptionmessagehasproduced.Eventhoughtheattackergotanencryptionmessage,itisalsounabletofindthecontentofmessage.Unfortunately,thismeth
8、odwillbeinsecurewhentheprivatekeyisstolenorbroken.Anotherwaytosolvethisproblemistohidesecretmessagebehi
