简介:Renderingoflarge-scaleforestscenesisachallengingtask,whosehighlygeometriccomplexitywillputheavyburdenoncurrentgraphicshardware.Whennavigatingthescene,theoverallvisualresultisgenerallyconsideredasthecoreconcern.Anewmethodisproposedinthispaperforlarge-scaleforestrenderingusingclusteringandmergingstrategies.Ourmethodimprovestherenderingeffectbyclusteringpolygonsaccordingtothepointinformationwithrelationtoneighbours.Afastforestrenderingsystemisdevelopedaccordingly.Therelativetechniquesinthesystemcanimprovethevisualqualityondemandofdifferentapplications.
简介:Three-dimensionelectronicchartdisplayinformationsystem(ECDIS)isoneofthenewdevelopingdirectionsofelectronicnavigationchart,anditsreal-timequalityisoneoftheimportantrequirements.Inthispaperthealgorithmofsimplifyingtrianglesurfaceusingedgecontraction,whichcanensurethereal-timedisplayofobjectsinseabedenvironment,wasputforward.TheoptimumcontractionpointwasdeterminedbytheLagrangematrix,sothatthealgorithmensuresthatthecontractionpointlocatesontheoriginalmodel,meanwhilemeetsthedemandsofleastdeviation.Thisalgorithmcanimprovetheplottingspeed,andpreservetheboundarycharacterbyusingthefewertrianglestosimulateobjects.
简介:Actionrefinementforreal-timeconcurrentprocesseswithurgentinteractionsisstudied,whereapartial-ordersetting,i.e.,timedbundleeventstructures,isusedasthesystemmodelandareal-timeLOTOS-likeprocessalgebraisusedasthespecificationlanguage.Itisshownthattheproposedrefinementapproacheshavethecommonlyexpectedproperties:(1)thebehaviouroftherefinedprocesscanbeinferredcompositionallyfromthebehaviouroftheoriginalprocessandfromthebehaviouroftheprocessessubstitutedforactions;(2)thetimedextensionsofpomset(partiallyorderedmultiset)traceequivalenceandhistorypreservingbisimulationequivalencearebothcongruencesundertherefinement;(3)thesyntacticandsemanticrefinementscoincideuptotheaforementionedequivalencerelationswithrespecttoacpo-baseddenotationalsemantics.
简介:Thenoisedatainverticalcomponentrecordsof85seismicstationsinFujianProvinceduring2012isusedastheresearchobjectinthispaper.Thenoisedataisdividedintofiveminutesegmentstocalculatethepowerspectra.Thehighreferencelineandlowreferencelineofstationarethenidentifiedbydrawingaprobabilitydensityfunctiongraph(PDF)usingthepowerspectralprobabilitydensityfunction.Moreover,accordingtotheanomaliesofPDFgraphsin85seismicstations,theabnormalnoiseisdividedintofourcategories:droppedpacket,lownoise,highnoise,andmediannoiseanomalies.Afterwards,fourselectionmethodsarefoundbythehighorlownoisereferencelineofthestations,andthesystemofreal-timemonitoringofseismicnoiseisformedbycombiningthefourselectionmethods.Noiserecordsof85seismicstationsinFujianProvinceinJuly2013areselectedforverification,andtheresultsshowthattheanomalousnoise-recognitionsystemcouldreacha90%successrateatmoststationsandtheeffectofselectionareverygood.Therefore,itcouldbeappliedtotheseismicnoisereal-timemonitoringinstations.
简介:Thispaperdescribesamulti-threatreal-timeseparatingsystemforbroadbandanti-radiationmissileseeker.Itpresentsamethod,withadual-portmemoryascomparer,toperformPFandPWhardwarereal-timeseparationandtodeterminethetime-of-arrival(TOA)byuseofsequentialdifferencehistogram(SDIF).Themethodhasbeenappliedtopractice,whichhasachievedgoodresults.
简介:Complexurbansceneryisgenerallycomposedofgiganticamountofdetailedbuildings,efficientrepresentationandrenderingareessentialforitsvisualization.Wepresentanacceleratingmethodforurbanvisualization.Ourapproachcanoptimizetheorganizationofmodelsinaccordancewiththequadtreebasedterrain,whichmakestheparallelizationeasier.Throughminimizingthedrawcallwithinonerenderingprocess,ourapproachcanreducethetimecostofeachframeandimprovetheframerategreatly.Hereby,oursystemcanhandlelarge-scaledetailedmodelswithhighdiversityandalsocanaffordtheabilitytoadjusttherenderingstrategyautomaticallyaccordingtothestateofthehardware.
简介:ThetraditionalorientedFASTandrotatedBRIEF(ORB)algorithmhasproblemsofinstabilityandrepetitionofkeypointsanditdoesnotpossessscaleinvariance.Inordertodealwiththesedrawbacks,amodifiedORB(MORB)algorithmisproposed.Inordertoimprovetheprecisionofmatchingandtracking,thispaperputsforwardanMOKalgorithmthatfusesMORBandKanade-Lucas-Tomasi(KLT).ByusingKalman,theobject’sstateinthenextframeispredictedinordertoreducethesizeofsearchwindowandimprovethereal-timeperformanceofobjecttracking.TheexperimentalresultsshowthattheMOKalgorithmcanaccuratelytrackobjectswithdeformationorwithbackgroundclutters,exhibitinghigherrobustnessandaccuracyondiversedatasets.Also,theMOKalgorithmhasagoodreal-timeperformancewiththeaverageframeratereaching90.8fps.
简介:Thispaperanalyzesthecurrentdifficultiesencounteredinon-lineinspectionsystemsofstripsurfacequality,specificallyrelatingtoproblemswithreal-timeprocessingofhugeamountsofdata.Toaddressthisneed,thispaperdescribesanFPGA-basedhigh-speedimageprocessingmodulewithbothhardwareandsoftwareaspects.Improvingthesetwoaspectstogetherwillhelpthesystemachievereal-timeprocessingofmassiveimagedata,andsimplifiesthearchitectureofthestripsurfacequalityon-lineinspectionsystem.
简介:Simulationandrenderingoflarge-scalenaturalenvironments,especiallytheocean,hasalwaysbeenoneofthehotissuesincomputergraphics,whichcanproviderealismforvariousapplicationssuchascomputergame,movieandmilitaryusage.Simulationofoceanenvironmentisoftenlackofrealismforreal-timeapplicationduetoitscomplexityofdynamicwaves.Inthispaper,amethodbasedonFFTWavemodelisproposedtosolvethisproblem,whichcanalsosimulatetheoceanopticpropertywithatmospherescattering.Furthermore,ourmethodhasalotofadvantagesincludingglobaloceandatasetsupport,real-time,dynamicreflectionofocean,thefoamonthewave,smoothtransitionfromdeepoceantoseacoast,etc.Theexperimentalresultsdemonstratetherealismandeffectivenessofourapproach.
简介:ThispaperextendstheSPHmethodtogassimulation.TheSPH(SmoothedParticlesHydrodynamics)methodisthemostpopularmethodofflowsimulation,whichiswidelyusedinlarge-scaleliquidsimulation.However,itisnotfoundtoapplytogassimulation,sincethosemethodsbasedonSPHcan’tbeusedinreal-timesimulationduetotheirenormousparticlesandhugecomputation.ThispaperproposesamethodforgassimulationbasedonSPHwithasmallnumberofparticles.Firstly,themethodcomputesthepositionanddensityofeachparticleineachpoint-in-time,andoutlinestheshapeofthesimulatedgasbasedonthoseparticles.Secondlythemethodusesthegridtechniquetorefinetheshapewiththediffusionofparticle’sdensityunderthecontrolofgrid,andgetmorelifelikesimulationresult.Eachgridwillbeassigneddensityaccordingtotheparticlesinit.Thedensitydeterminesthefinalappearanceofthegrid.Forensuringthenaturaltransitionofthecolorbetweenadjacentgrids,wegiveadiffuseprocessofdensitybetweenthesegridsandassignappropriatevaluestovertexesofthesegrids.Theexperimentalresultsshowthattheproposedmethodcangivebettergassimulationandmeettherequestofreal-time.
简介:Theconventionaldatawarehousecanonlyanalyzehistoricaldata.Thispaperproposesaconceptofagent-basedreal-timedatawarehouseinBIsystem,Withthismodelwecanimprovethereal-timeperformanceofdatawarehouse.Ontheotherhand,theBIsystemflexibilityisenhancedinthismodel,whichmakesitmuchmoreefficienttomanagethedistributedenvironment.
简介:"Real-TimeSpeechRecognitionSystem"(RTSRS),developedbyInstituteofAcous-ticsAcademiaSINICA,washonoredbyaninternationalaward(25,000FF)athightechnolgyexhibition《TechnologieetComp(?)tivit(?)》heldatGrenobleofFranceonOctober1988.Morethan10,000exhibitsfrom12countrieswerepresentedand4exhibitswerehonoredawards.Thetechnicalcommiteeoftheexhibition"Real-TimeSpeechRecognitionSystem"(RTSRS),developedbyInstituteofAcous-ticsAcademiaSINICA,washonoredbyaninternationalaward(25,000FF)athightechnolgyexhibition《TechnologieetCompétivité》heldatGrenobleofFranceonOctober1988.Morethan10,000exhibitsfrom12countrieswerepresentedand4exhibitswerehonoredawards.ThetechnicalcommiteeoftheexhibitionacknowlegedthattheRTSRShasspecialadvancedcharacteristicsbothintechnicalimprovementandineconomicusage.(YUTiecheng)
简介:ToperformthegroundtestofaspaceborneSyntheticApertureRadar(SAR)system,anechosimulatorwiththecharacteristicsofmultimode,multi-assemblage,andrealtimeisproposedinthispaper.Ahardwareplatformofthereal-timeechosimulatorbasedontheVPXbusisdesigned.Withthisplatform,real-timemulti-pointechogenerationandscenariotargetsechogenerationcanbeachievedbythereal-timesignalprocessinginFieldProgrammableGateArray(FPGA),utilizingtheparameterscalculatedbytheindustrycomputers.Furthermore,thisplatformcanoutputdifferentsignalsifitisexpandedtomulti-channels,makingitpossiblefortheassignmentofechogenerationandtestindifferentspaceborneSARmodes.ThetestresultswiththeactualSARsystemshowthatthisplatformcansatisfythesystemrequirementsandisnowusedinpractice.