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1、英文文献原文AcascadediterativeFouriertransformalgorithmforopticalsecurityapplicationsAbstract:AcascadediterativeFouriertransform(CIFT)algorithmispresentedforopticalsecurityapplications.Twophase-masksaredesignedandlocatedintheinputandtheFourierdomainsofa4-fcorrela
2、torrespectively,inordertoimplementtheopticalencryptionorauthenticityverification.Comparedwithpreviousmethods,theproposedalgorithmemploysanimprovedsearchingstrategy:modifyingthephase-distributionsofbothmaskssynchronouslyaswellasenlargingthesearchingspace.Com
3、putersimulationsshowthatthealgorithmresultsinmuchfasterconvergenceandbetterimagequalityfortherecoveredimage.Eachofthesemasksisassignedtodifferentperson.Therefore,thedecryptedimagecanbeobtainedonlywhenallthesemasksareunderauthorization.Thiskey-assignmentstra
4、tegymayreducetheriskofbeingintruded.Keywords:Opticalsecurity–opticalencryption–cascadediterativeFouriertransformalgorithm1.IntroductionOpticaltechniqueshaveshowngreatpotentialinthefieldofinformationsecurityapplications.RecentlyRéfrégierandJavidiproposedanov
5、eldouble-random-phaseencodingtechnique,whichencodesaprimaryimageintoastationarywhitenoise.ThistechniquewasalsousedtoencryptinformationinthefractionalFourierdomainandtostoreencryptedinformationholographically.Phaseencodingtechniqueswerealsoproposedforoptical
6、authenticityverification.WangetalandLietalproposedanothermethodforopticalencryptionandauthenticityverification.Unlikethetechniquesmentionedabove,thismethodencryptsinformationcompletelyintoaphasemask,whichislocatedineithertheinputortheFourierdomainofa4-fcorr
7、elator.Forinstance,giventhepredefinitionsofasignificantimagef(x,y)asthedesiredoutputandaphase-distributionexp{jb(u,v)}intheFourierdomain,it’seasytooptimizetheotherphasefunctionexp{jp(x,y)}withamodifiedprojectionontoconstraintsets(POCS)algorithm[10].Therefor
8、etheimagef(x,y)isencodedsuccessfullyintoexp{jp(x,y)}withtheaidofexp{jb(u,v)}.Inotherwords,thefixedphaseexp{jb(u,v)}servesasthelockwhiletheretrievedphaseexp{jp(x,y)}servesasthekeyofthesecuritysystem.Tor
