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1、DWTBasedRobustImageHashingAlgorithmYuanyuanHuXiamuNiuInformationSecurityTechniqueResearchCenterInformationCountermeasureTechniqueResearchInstituteHarbinInstituteofTechnologyShenzhenGraduateSchoolHarbinInstituteofTechnologyShenzhen,ChinaHarbin,Chinahuyyszu@szu.edu.cnxiamu.niu@hit.edu.cnA
2、bstract—JPEG2000isawavelet-basedimagecompressiondistortionsinthesmoothareaoraroundtheedge[11],low-standardandcodingsystem.ItwillsupersedetheoriginalJPEGlevelfeaturebasedhashingalgorithmsaredeemedtobebetterstandardinthefuture.ComparedwithCounterlettransformorforimageauthentication.Compar
3、edwiththetransformationinGaborfilter,wavelettransformusedinJPEG2000islessordertoextractedgefeatures,suchasContourlettransform[9],effectivetoextractrobustedgefeatures.Inthispaper,anovelorGaborfilter[10],discretewavelettransform(DWT)islessdiscretewavelettransform(DWT)basedimagehashingeffe
4、ctive.InDWT-basedalgorithm,structurebasedalgorithmalgorithmisproposed.RobustbitsofHL,LHandHHsub-band[6]ismostpopular.In[6],robuststructuralrelationbetweenainthesamemiddle-frequencyscaleareextractedfirst.Then,theyparentandchildnodeisexploredandextractedtogeneratearefusedtogeneratethehash
5、.Experimentalresultsshowthatrobusthash.However,forJPEG2000images,sincetheircodetheproposedalgorithmishighlyrobusttocontentpreservingstreamisscalable,itmeansthatthecodestreamisneededtooperationsaswellashavinganexcellentperformanceondecodecompletely.Besides,structuralsignatureisverytamper
6、inglocalization.Inaddition,sincerobustfeaturesaresensitivetogeometricdistortions[3].extractedinthesamescale,thegenerationofhashisonlyneededtodecodeJPEG2000imagecodestreampartially.Toovercometheabovelimit,anovelDWTbasedrobustimagehashingisproposedinthispaper.RobustbitsareKeywords-imageha
7、shing;DWT;JPEG2000;tamperingextractedinthesubbandsofthesamemiddlefrequencyscale,localization;authenticationwhichmeansthatitisonlyneededtodecodeJPEG2000imagecodestreampartially.TheefficiencyisimprovedgreatlyI.INTRODUCTIONcomparedwithstructuralsignature[6].Meanwhile,insteadofRobu
