简介:In3Dmodelsretrieval,featuredescriptionandretrievalofnon-rigidmodelfacemorecomplexproblemsduetotheisometrytransformationofitself.Weintroducethehierarchicalcombinationmatchingintothefeaturecomparison,andbuildamapbetweenthedividedregionsoftwomodels,andthenachieveaccuratefeaturematchingbasedonpatch-by-patch,whichsuccessfullyintroducesthespatialinformationintofeaturematching.Verifiedbyexperiment,the3Dmodelretrievalmethodproposedinthispaperbasedonhierarchicalcombinationmatchingcanmakesuremoreaccuratefeaturematching,soastoenhancetheprecisionofretrieval.
简介:Currently,3Dprintingofthecharacterdollsisaverypracticalapplicationfortheaverageperson.Butthemodelofdollwhichcanbeobtainedisstaticsothepostureofthedollissingle.Ontheotherhand,themodificationofthemodelisverydifficulttonon-professions.Thispaperproposesanrapidgenerationmethodofcharacterdollwithrotatablelimbs,whichisthroughaddingthespherejointtothedoll’smodelautomatically.Afterthemodelissegmentedbydrawingalineinteractively,thespherejointiscreatedbasedonthesegmentationboundarythroughentitymodelingmethod.Lastlythetwomodelsofthedollandthejointarecompositedandprinted.Somedoll’smodelaretestedontheFDM(FusedDepositionModeling)3Dprinterusingthisprocess.Theresultsaremoreinterestingandtheefficiencyhasbeengreatlyimprovedcomparedwithmodifyingthemodelmanually.
简介:Mobileplatformisnowwidelyseenasapromisingmultimediaservicewithafavorableusergroupandmarketprospect.Tostudytheinfluenceofmobileterminalmodelsonthequalityofsceneroaming,aparametersettingplatformofmobileterminalmodelsisestablishedtoselecttheparameterselectionandperformanceindexondifferentmobileplatformsinthispaper.Thistestplatformisestablishedbasedonmodeloptimalityprinciple,analyzingtheperformancecurveofmobileterminalsindifferentscenemodelsandthendeducingtheexternalparameterofmodelestablishment.Simulationresultsprovethattheestablishedtestplatformisabletoanalyzetheparameterandperformancematchinglistofamobileterminalmodel.
简介:TheprecisionforgingprocessissimulatedbycommercialsoftwareDeform3Dusingarigidvisco-plasticmodeltopredictthestatusofmetalflowandthedistributionofequivalentplasticstrain,providingguidanceformakingdecisionontheoptimalchoiceofprocessparametersandmouldstructure.TrialforgingwasusedtoverifytheeffectivenessofFEMsimulationresults.
简介:Animprovedself-organizingfeaturemap(SOFM)neuralnetworkispresentedtogeneraterectangularandhexagonallatticwithnormalvectorattachedtoeachvertex.Aftertheneuralnetworkwastrained,thewholescattereddataweredividedintosub-regionswhereclassifiedcorewererepresentedbytheweightvectorsofneuronsattheoutputlayerofneuralnetwork.Theweightvectorsoftheneuronswereusedtoapproximatethedense3-Dscatteredpoints,sothedensescatteredpointscouldbereducedtoareasonablescale,whilethetopologicalfeatureofthewholescatteredpointswereremained.
简介:SystemoptimizationplaysacrucialroleindevelopingVRsystemafter3Dmodeling,affectingthesystem'sImmersionandInteractionperformanceenormously.Inthisarticle,severalkeytechniquesofoptimizingavirtualminingsystemwerediscussed:optimizing3DmodelstokeepthepolygonnumberinVRsystemwithintargethardware'sprocessingability;optimizingtexturedatabasetosavetexturememorywithperfectvisualeffect;optimizingdatabasehierarchystructuretoacceleratemodelretrieval;andoptimizingLODhierarchystructuretospeeduprendering~
简介:Afamilyofpiecewiserationalquinticinterpolationispresented.Eachinterpolationofthefamily,whichisidentifieduniquelybythevalueofaparameterαi,isofC2continuitywithoutsolvingasystemofconsistencyequationsforthederivativevaluesattheknots,andcanbeexpressedbythebasisfunctions.InterpolantisofO(hr)accuracywhenf(x)?Cr[a,b],andtheerrorshaveonlyasmallfloatingforabigchangeoftheparameterαi,itmeanstheinterpolationisstablefortheparameter.Theinterpolationcanpreservetheshapepropertiesofthegivendata,suchasmonotonicityandconvexity,andaproperchoiceofparameterαiisgiven.