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1、级联迭代傅里叶变换算法在光学安全中的应用英文文献及翻译AcascadediterativeFouriertransformalgorithmforopticalsecurityapplicationsAbstract:AcascadediterativeFouriertransformCIFTalgorithmispresentedforopticalsecurityapplications.Twophase-masksaredesignedandlocatedintheinputandtheFourierdomainso
2、fa4-fcorrelatorrespectively,inordertoimplementtheopticalencryptionorauthenticityverification.Comparedwithpreviousmethods,theproposedalgorithmemploysanimprovedsearchingstrategy:modifyingthephase-distributionsofbothmaskssynchronouslyaswellasenlargingthesearchingspac
3、e.Computersimulationsshowthatthealgorithmresultsinmuchfasterconvergenceandbetterimagequalityfortherecoveredimage.Eachofthesemasksisassignedtodifferentperson.Therefore,thedecryptedimagecanbeobtainedonlywhenallthesemasksareunderauthorization.Thiskey-assignmentstrate
4、gymayreducetheriskofbeingintruded.Keywords:Opticalsecurity?opticalencryption?cascadediterativeFouriertransformalgorithm1.IntroductionOpticaltechniqueshaveshowngreatpotentialinthefieldofinformationsecurityapplications.RecentlyRéfrégierandJavidiproposedanoveldouble-
5、random-phaseencodingtechnique,whichencodesaprimaryimageintoastationarywhitenoise.ThistechniquewasalsousedtoencryptinformationinthefractionalFourierdomainandtostoreencryptedinformationholographically.Phaseencodingtechniqueswerealsoproposedforopticalauthenticityveri
6、ficationWangetalandLietalproposedanothermethodforopticalencryptionandauthenticityverification.Unlikethetechniquesmentionedabove,thismethodencryptsinformationcompletelyintoaphasemask,whichislocatedineithertheinputortheFourierdomainofa4-fcorrelator.Forinstance,given
7、thepredefinitionsofasignificantimagefx,yasthedesiredoutputandaphase-distributionexpjbu,vintheFourierdomain,it’seasytooptimizetheotherphasefunctionexpjpx,ywithamodifiedprojectionontoconstraintsetsPOCSalgorithm[10]Thereforetheimagefx,yisencodedsuccessfullyintoexpjpx
8、,ywiththeaidofexpjbu,v.Inotherwords,thefixedphaseexpjbu,vservesasthelockwhiletheretrievedphaseexpjpx,yservesasthekeyofthesecuritysystem.Toreconstructthe
