简介：Theregularizedimageinterpolationmethodiswidelyusedbasedonthevectorinterpolationmodelinwhichdown-samplingmatrixhasverylargedimensionandneedslargestorageconsumptionandhighercomputationcomplexity.Inthispaper,afastalgorithmforimageinterpolationbasedonthetensorproductofmatricesispresented,whichtransformsthevectorinterpolationmodeltomatrixform.Theproposedalgorithmcanextremelyreducethestoragerequirementandtimeconsumption.Thesimulationresultsverifytheirvalidity.

简介：Reconstructionofabsorptioncoefficientμ_aandscatteringcoefficientμ_aisveryimportantforapplicationsofdiffuseopticaltomographyandnearinfraredspectroscopy.Aimingattheearlycancerdetectionofcervixandstomach,wepresentafastinverseMonte-Carloschemeforextractingμ_aandμ_sofatubulartissuefromthemeasurementonfrequencydomain.Resultsshowthatthecomputationtimeforreconstructingonesetofμ_aandμ_sislessthan1minandtherelativeerrorsinreconstructionarelessthan±10%fortheopticalpropertiesofnormalcervicaltissueandprecancerouslesions.

简介：Thefastparallelrestoration（FPR）schemeisproposedtoachievethefastsetupofrestorationlabelswitchedpath（LSP）inthedistributedopticalnetworks.TheschemeisderivedbydividingthewholerestorationLSPintoseveralsegmentsofsub-LSPandtriggeringeachsub-LSPalongthenewroutetofinishthesignalingprocedureconcurrently,andsubsequentlymergingallsub-LSPsintoawholeLSP.ThetheoreticalanalysisandsimulationresultsshowthattheFPRschemeoutperformstheothertwotypicalrestorationschemesintermsofconnectionsetuptime.

简介：Wepresentamethodthataccuratelymeasureslargeopticalsurfacesbeforepolishingusingalasertracker.Usingthescanningmodeofthelasertrackerconsiderablyimprovesmeasurementefficiencyandminimizesthedominanterrorscausedbyenvironmentalchange.WeusethismethodtomeasureaΦ1.3-masphericmirrorandobtainameasurementuncertaintyof0.72μm(rootmeansquare,RMS).

简介：ResearchdemonstratesthataFresnelhologramcanbegeneratedandsimultaneouslyencryptednumericallybasedonasecretsymmetrickeyformedbythemaximallengthsequence(M-sequence).Themethodcanbedirectlyextendedtoencryptavideoholographicclipinaframe-by-framemanner.However,giventhelimitedcombinationofsignalsinthefamilyofM-sequence,hackingthesecretkeythroughtrialanderrorcanbetimeconsumingbutnotdifficult.Inthisletter,weproposeamethodthatisdifficulttocrackwithbruteforceforencryptingaholographicvideosequence.AnM-sequenceisfirstrandomlyassignedtoencrypteachframeoftheholographicvideosignal.Subsequently,theindexoftheselectedM-sequence,whichisnecessarytodecryptthehologram,isencryptedwiththeRSAalgorithmbeforetransmittingtothereceivingend.Atthereceivingend,thedecoderisprovidedwithaprivatekeytorecovertheindexforeachframe,andthecorrespondingM-sequenceisusedtodecrypttheencodedhologram.

简介：Twodifferentmethodsfromgraphicprocessingunit(GPU)andcentralprocessingunit(CPU)areproposedtosuitablyoptimizelook-uptablealgorithmsofcomputergeneratedholography(CGH).Thenumericalsimulationsandexperimentalresultsshowthatwecanreconstructagoodqualityobject.ThecomputationofCGHforathree-dimensional(3D)dynamicholographicdisplaycanalsobespedupbyprogrammingwithourproposedmethod.Itcanoptimizebothfileloadingandtheinlinecalculationprocess.Thephase-onlyCGHwithgigabytedataforreconstructing10MBobjectsamplingsisgenerated.Inaddition,theproposedmethodeffectivelyreducedtimecostsofloadingandwritingofflinetablesonaCPU.ItisbelievedtheproposedmethodcanprovidehighspeedandhugedataCGHfor3Ddynamicholographicdisplaysinthenearfuture.

简介：Real-timemeasurementofthefastaxisangleofaquarter-waveplatebasedonsimultaneousphaseshiftingtechniqueispresented.Thesimultaneousphaseshiftingfunctionisrealizedbyanorthogonalgrating,adiaphragm,ananalyzerarray,anda4-quadrantdetector.Theintensitiesofthelightbeamsfromthefouranalyzerswithdifferentazimuthsaremeasuredsimultaneously.Thefastaxisangleofthequarter-waveplateisobtainedthroughthefourlightintensityvalues.Inthismethod,rotatingelementsarenotrequired,soreal-timemeasurementisachieved.