简介:Theregularizedimageinterpolationmethodiswidelyusedbasedonthevectorinterpolationmodelinwhichdown-samplingmatrixhasverylargedimensionandneedslargestorageconsumptionandhighercomputationcomplexity.Inthispaper,afastalgorithmforimageinterpolationbasedonthetensorproductofmatricesispresented,whichtransformsthevectorinterpolationmodeltomatrixform.Theproposedalgorithmcanextremelyreducethestoragerequirementandtimeconsumption.Thesimulationresultsverifytheirvalidity.
简介:Aspectroscopicmethodtodeterminethicknessofquartzwaveplateispresented.Themethodisbasedonchromaticpolarizationinterferometry.Withthepolarization-resolvedtransmissionspectrum(PRTS)curve,thephaseretardationofquartzwaveplatecanbedeterminedatawidespectralrangefrom200to2000nmobviously.ThroughaccuratejudgmentofextremepointsofPRTScurveatlong-waveband,thephysicalthicknessofquartzwaveplatescanbeobtainedexactly.Wegiveameasuringexampleandtheerroranalysis.Itisfoundthatthemeasuringprecisionofthicknessismainlydeterminedbythespectralresolutionofspectrometer.
简介:Thenumericalmoirémethodwithsensitivityashighas0.03nmhasbeenpresented.Aquantitativedisplacementandstrainanalysisprogramhasbeenproposedbyusingthismethod.Itisappliedtoauedgedislocationandastackingfaultinaluminum.ThemeasuredstrainofedgedislocationiscomparedwiththeoreticalpredictiongivenbyPeierls-Nabarrodislocationmodel.Thedisplacementofstackingfaultisalsoobtained.
简介:Manyapproachesforhigh-resolutionimagereconstructionhavebeenproposedinsomeliteratures.Oneofthemostcommonlywaysistoreconstructahigh-resolutionimagefromanumberofrotatedandtranslatedimageswithlowresolution.Inthisprocess,theexposuredifferenceamongoriginalimageswilldecreasethequalityofthereconstructedimage.Inordertoremovetheinfluenceoftheexposuredifference,alightenergymatchingmethodisproposedinthispaper.Thetheoreticalanalysisisillustratedindetails.Experimentalresultsshowthatthetheoreticalanalysisiscorrectandtheproposedmethodisvalid.
简介:Afeasiblemethodofcombiningtheconceptoffluorescencehalf-lifeandthepowerdependentphoto-bleachingrateforcharacterizingthepracticalphotostabilityoffluorescentproteins(FPs)wasintroduced.Furthermore,byusingafluorescentphotostabilitystandard,arelativecomparisonofthephotostabiltyofFPsfromdifferentresearchgroupswasproposed,whichwouldbeofgreatbenefitfordevelopingnovelFPswithoptimizedemissionwavelength,betterbrightness,andimprovedphotostability.Weusedrho-damineBasanexampletoverifythismethodandevaluatethepracticalphotostabilityofafar-redFP,mKate-S158C.Experimentalresultsindicatedgoodpotentialofthismethodforfurtherstudy.
简介:Anewtechnologyoflightninglocationisdescribed,whichisbasedondetectingthestateofpolarization(SOP)fluctuationofthelaserlightintheopticgroundwire(OPGW).Comparedwiththeconventionallightninglocationmethod,thenewmethodismoreaccurate,morestable,andcheaper.TheoriesofStokesparametersandPoincaresphereareintroducedtoanalyzetheSOPatthelightningstrikepoint.ItcanbeconcludedthatalthoughtheinitialpointsofSOPonthePoincarespherearerandom,theSOPfluctuationgeneratedbylightningstrikecanstillbeaccuratelyidentifiedbydetectingthevelocityofpolarizationmotion.Anewalgorithmtoquantifythevelocityisalsointroduced.
简介:Toachievelowerassemblydelayatopticalburstswitchingedgenode,thispaperproposesanapproachcalledcurrentweightlengthprediction(CWLP)toimproveexistingestimatemechanisminburstassembly.isintroducedtomakeadynamictradeoffbetweenthecurrentandpasttrafficunderdifferentoffsettime.SimulationresultsshowthatCWLPcanachieveasignificantimprovementintermsoftrafficestimationinvariousoffsettimeandofferedload.
简介:Thebasicideaofthefiniteelementbeampropagationmethod(FE-BPM)isdescribed.Itisappliedtocalculatethefundamentalmodeofachannelplasmonicpolariton(CPP)waveguidetoconfirmitsvalidity.Boththefielddistributionandtheeffectiveindexofthefundamentalmodearegivenbythemethod.Theconvergencespeedshowstheadvantageandstabilityofthismethod.Thenaplasmonicwaveguidewithadielectricstripdepositedonametalsubstrateisinvestigated,andthegroupvelocityisnegativeforthefundamentalmodeofthiskindofwaveguide.Thenumericalresultshowsthatthepowerflowdirectionisreversetothatofphasevelocity.
简介:Stripenonuniformityisverytypicalinlineinfraredfocalplane(IRFPA)anduncooledstarringIRFPA.Wedeveloptheminimummeansquareerror(MMSE)methodforstripenonuniformitycorrection(NUC).ThegoaloftheMMSEmethodistodeterminetheoptimalNUCparametersformakingthecorrectedimagetheclosesttotheidealimage.Moreover,thismethodcanbeachievedinoneframe,makingitmorecompetitivethanotherscene-basedNUCalgorithms.Wealsodemonstratethecalibrationresultsofouralgorithmusingrealandvirtualinfraredimagesequences.Theexperimentsverifythepositiveeffectofouralgorithm.
简介:ThreekindsofKH2PO4rawmaterialareusedtogrowdeuteratedpotassiumdihydrogenphosphate(DKDP)crystalsbytraditionalandrapidgrowthmethods,respectively.Thegrowthhabitdependenceonthepurityofrawmaterialisdescribedandanalyzed.Theopticalpropertiesincludingtransmissionspectraandlaser-induceddamagethresholdofthesecrystalsaremeasured.Itisfoundthatthegrowthmethodaffectstheopticalpropertiesofcrystalmoreobviouslythantherawmaterialwiththemasscontentofmainmetalionsbelow1ppm.Moreover,themorphologyofthecoreintheobserveddamagesitesindicatesthatanexplosionprocessprobablyoccursduringlaser-inducedbreakdown.
简介:Weproposeanovelsmall-anglemeasuringopticalmethodbasedontheastigmaticeffectoftwoorthogonallyplacedcylindricallenses.Accordingtotheone-to-onecorrespondencebetweenthelaserspotshapeandtheangle,theangleisdetermined.Wetheoreticallyanalyzethemeasuringrangeanddemonstratethatalongerdistancebetweentherotatingaxisandtheopticalaxisleadstoasmallermeasuringrange,butbettersensitivity.Also,anassociatedexperimentalsystemisestablishedandameasuringrangeof0.94mrad(cubicfitr=0.9993)aswellasagoodlinearrangeof0.37mrad(linearfitr=0.9994)witharesolutionof8μradisachieved.
简介:Basedontheprincipleofspatialpyramidforsignal,amulti-scaletransformoftwo-dimensional(2D)in-terpolatingpyramidisconstructedbythenonlinearmedianoperator.Thetransformpropertiesoferrordiffusehalftoningnoiseonmultiplescalesareinvestigatedandanalyzedthroughexperiments.Accordingtotheseproperties,arobustinversehalftoningmethodisproposed.Thehalftoningimageisfirstlypre-processedbyaGaussianlow-passfilter,anddecomposedbytheone-scaletransform.ThenaWienerfilterisemployedtothedetailedcoefficients.Finallyaninverseimageisreconstructed.Experimentalresultsshowthattheproposedtransformhastheadvantageofseparatingthehalftoningnoiseandimagedetailoverlinearmulti-resolutiontransform.Thepresentedinversehalftoningmethodperformssomeexcellentabilitiesonsharpedge,highpeaksignal-to-noiseratio(PSNR),andsmallmemoryrequirement.
简介:Aspectral-based8-inkcharacterizationmodelisdevelopedtoaccuratelypredicttherecipeforamulti-inkprinter.The8-inkcolorseparationmethodisaunionoffive3-inkandsix4-inkcombinationsbasedonthecellularYule-NielsenspectralNeugebauermodelwitharecipeselectionstrategy.Theperformancelevelsoftheforwardandbackwardmodelsareevaluatedforindividualinkcombinationsusingprintedtestingsamples.Furthermore,thespectral-basedmethodperformsbettercomparedwiththeXYZ-basedapproach.Onthebasisofthebackwardmodelperformance,anovelfastrecipeselectionstrategyisproposedandestimated.
简介:DNAtetrahedralnanostructuresareconsideredtobenewnanocarriersbecausetheycanbepreciselycontrolledandholdexcellentpenetrationabilitytothecellularmembrane.AlthoughtheDNAtetrahedralnanostructureisextensivelystudiedinbiologyandmedicine,itsbehaviorinthecellswithnanoscaleresolutionisnotunderstoodclearly.Inthisletter,wedemonstratesuperresolutionfluorescenceimagingofthedistributionofDNAtetrahedralnanostructuresinthecellwithasimulatedemissiondepletion(STED)microscope,whichisbuiltbasedonaconventionalconfocalmicroscopeandcanprovidearesolutionof70nm.
简介:Eigenfacemethodusedinfacerecognitionisintroducedtoreducethepatternofinterferencefringesappearingintheabsorptionimageofcoldrubidiumatomcloudtrappedbyanatomchip.Thestandardmethodforprocessingtheabsorptionimageisproposed,andtheoriginoftheinterferencefringesisanalyzed.Comparedwiththestandardprocessingmethodwhichusesonlyonereferenceimage,wetakeadvantageoffiftyreferenceimagesandreconstructanewreferenceimagewhichismoresimilartotheabsorptionimagethanallofthefiftyoriginalreferenceimages.Thenobviousreductionofinterferencefringescanbeobtained.
简介:Anewapproachisproposedtoaccuratelydeterminethethicknessoffilms,especiallyforultra-thinfilms,throughspectrum-fittingwiththeassistanceofaninterferencelayer.Thedeterminationlimitcanreachevenlessthan1nm.Itsaccuracyisfarbetterthanthatofthetraditionalmethods.Thisdeterminationmethodisverifiedbyexperiments,andthedeterminationlimitisatleast3.5nmcomparedwiththeresultsofatomicforcemicroscope(AFM).Furthermore,adoubleinterference-aidedspectrafittingmethodisproposedtoreducetherequirementsofthedeterminationinstruments,whichthusallowsonetodeterminethefilm’sthicknesswithalow-precisioncommonspectrometerandtogreatlylowerthecost.Itisaveryhigh-precisiondeterminationmethodforon-siteandin-situapplications,especiallyforultra-thinfilms.
简介:Anewhyperspectralimagecompressionmethodofspectralfeatureclassificationvectorquantization(SFCVQ)andembeddedzero-treeofwavelet(EZW)basedonKarhunen-Loevetransformation(KLT)andintegerwavelettransformationisrepresented.Incomparisonwiththeothermethods,thismethodnotonlykeepsthecharacteristicsofhighcompressionratioandeasyreal-timetransmission,butalsohastheadvantageofhighcomputationspeed.AfterliftingbasedintegerwaveletandSFCVQcodingareintroduced,asystemofnearlylosslesscompressionofhyperspectralimagesisdesigned.KLTisusedtoremovethecorrelationofspectralredundancyasone-dimensional(1D)lineartransform,andSFCVQcodingisappliedtoenhancecompressionratio.Thetwo-dimensional(2D)integerwavelettransformationisadoptedforthedecorrelationof2Dspatialredundancy.EZWcodingmethodisappliedtocompressdatainwaveletdomain.ExperimentalresultsshowthatincomparisonwiththemethodofwaveletSFCVQ(WSFCVQ),themethodofimprovedBiBlockzerotreecoding(IBBZTC)andthemethodoffeaturespectralvectorquantization(FSVQ),thepeaksignal-to-noiseratio(PSNR)ofthismethodcanenhanceover9dB,andthetotalcompressionperformanceisimprovedgreatly.
简介:Wereportamethodforsimultaneouslyanddirectlymeasuringallsix-degrees-of-freedom(six-DOF)motionerrorsofarotaryaxis.Suchamethodcombinestheprinciplesoflaserinterferometryandlasercollimationmeasurement.Onereferencerotaryaxisandtworetro-reflectorsareusedtoachievesimultaneoussensitivitytoallsixerrorsinafull-circlemeasuringrange.Asnoseparationmodelsarerequired,ourmethodiscapableofdynamicallymeasuringtheseerrorsinrealtimeandconvenientlydeterminingtheoriginoftheerrors.Anautomaticmeasuringdeviceisbuilt.Theeffectivenessofourmethodisexperimentallydemonstrated.