简介:1IntroductionWiththeintroductionofcomputersintomainstreammanufacturingactivities,feature-basedgeometricalmodelhasbecomethek...
简介:Itisprovedthatamongtheregularpolygonswithprimeedges,onlytheregularpolygonswithFermatprimeedgesareconstructablewithcompassandstraightedge.As17isaFermatprimenumber,theconstructionofheptadecagonhasbeendiscussingallthetime.Manydifferentconstructionmethodsareproposedalthoughtheyarebasedonthesametheory.Simplificationoftheconstructionisstillasensibleproblem.Here,weproposeasimplemethodforconstructingregularheptadecagonwiththefeweststeps.Theaccumulationofconstructionerrorsisalsoavoided.Thismethodismoreapplicablethanthepreviousconstruction.
简介:Inthispaper,anewalgorithmforrepresentingconicspreciselyispresentedusingNURBSofdegreetwo.Thealgorithmrequiresonlyfourcontrolvertices,whichistheminimumnumberofcontrolverticescomparedwiththeotheralgorithmsusingthesquarecontrolverticeconfiguration,torepresentafullcircleusingthefullcircumscribingsquarebasedrepresentation.Thispaperalsoderivesanewcon-ditionforNURBStopreciselyrepresentconicsandshowsthenecessaryandsufficientconditionofrep-resentationofacirculararc.
简介:Inthiswork,anovelmethodforsculpturedsurfacesubdivisiontoimprovethemachinery'sabilityandefficiencyin5-axisCNCmachiningcomplexsurfaceisintroduced.Themethodsubdividesautomaticallyamonolithicconvexorconcaveorsimultaneouslycomplexsculpturedsurfaceintoanumberofsurfacepatchesandachievesthegoalofsimilarnormaldirectionsandsmalldifferencebetweenthecurvaturesineverypatchbyusingweightfuzzyclusteralgorithmwhichtakesthecurvaturesandnormalvectorsofthesculpturedsurfaceintoaccountsimultaneously.TheinclinationanglevariationbetweeneverytwoCutterContactPoints(CCPoints)isdecreasedineverypatchtoavoidlarge-anglerotationoftooltosavemachiningtimewhenaflat-endmillisused.Thisworkcontributestoautomating5-axisCNCtoolpathgenerationforsculpturedpartmachiningandformingafoundationforfurtherresearch.
简介:Ahandgesturerecognitionmethodispresentedforhuman-computerinteraction,whichisbasedonfingertiplocalization.First,handgestureissegmentedfromthebackgroundbasedonskincolorcharacteristics.Second,featurevectorsareselectedwithequalintervalsontheboundaryofthegesture,andthengestures'lengthnormalizationisaccomplished.Third,thefingertippositionsaredeterminedbythefeaturevectors'parameters,andanglesoffeaturevectorsarenormalized.Finallythegesturesareclassifiedbysupportvectormachine.Theexperimentalresultsdemonstratethattheproposedmethodcanrecognize9gestureswithanaccuracyof94.1%.
简介:Thispaperproposesanewfacialbeautificationmethodusingfacialrejuvenationbasedontheageevolution.Traditionalfacialbeautificationmethodsonlyfocusonthecolorofskinanddeformationanddothetransformationbasedonanexperimentalstandardofbeauty.Ourmethodachievesthebeautyeffectbymakingfacialimagelooksyounger,whichisdifferentfromtraditionalmethodsandismorereasonablethanthem.Firstly,wedecomposetheimageintodifferentlayersandgetadetaillayer.Secondly,wegetanage-relatedparameter:thestandarddeviationoftheGaussiandistributionthatthedetaillayerfollows,andthesupportvectormachine(SVM)regressionisusedtofitafunctionabouttheageandthestandarddeviation.Thirdly,weusethisfunctiontoestimatetheageofinputimageandgenerateanewdetaillayerwithanewstandarddeviationwhichiscalculatedbydecreasingtheage.Lastly,wecombinetheoriginallayersandthenewdetaillayertogetanewfaceimage.Experimentalresultsshowthatthisalgorithmcanmakefacialimagebecomemorebeautifulbyfacialrejuvenation.Theproposedmethodopensupanewwayaboutfacialbeautification,andtherearegreatpotentialsforapplications.
简介:InterpolatingasetofplanarpointsisacommonprobleminCAD.Mostconstructionsofinterpolationfunctionsarebasedontheparametersatthesamplepoints.Assigningparameterstoallsamplepointsisavitalstepbeforeconstructinginterpolationfunctions.Themostwidelyusedparameterizationmethodisaccumulativechordlengthparameterization.Inthispaper,wegiveoutabettermethodbasedontheinterpolationofconics.Basedonthismethod,asequenceoffairerHermitecurvescanbeconstructed.
简介:Parameterizationoftrianglemeshesisafundamentalproblemfortexturemapping,surfacefitting,surfacereconstruction,andmeshediting.Thedeformationoftriangularmeshescausedbytheparameterizedprocessisthemeasurementofparameterization.Traditionalstandardmethodhasitslimitationwhenevaluatingmixturedistortionenergyparameterizations.Thusanevaluationmethodbasesondistortionenergyparameterizationoftriangularmeshesisintroducedforthelimitation.Thenovelmethodemploysanadaptiveexpressionformtothemixtureenergy,andusesaweightfactortorepresentdistortionenergydistribution.Byusingthismethod,wecanevaluateallkindsofparameterizationinauniformmeasurementandacquireamoreintuitiveandclearevaluation.
简介:Amethodforfairingasurfacecomposedofasetofdiscretedatapointsdistributedinanonrectangulartopologicalmeshispresented.AllcurvesareexpressedbynonuniformcubicB-splinecurves.Thefairingmethodisminimizingtheelasticstrainenergyofmeshcurvesandofspringsat-tachedtothedatapoints.Thefairingsurfacecanbegeneratedbyinterpolatingthroughthemeshcurves.Thegenerationandfairingofashiphullsurfaceisgivenasanexample.
简介:Wepresentacrust-basedprocedureformodelinghumanbeing’sbone,whichisbasedonvoronoidiagramanditsdual,Delaunaytriangulation.Inthree-dimensionalspace,thecrustalgorithmcangeneratea3D-modelusingasetofsamplepoints.ThepurposesofthispaperistoextractprecisecontourfromCTseries,thenrefertothesecontoursassamplepoints,andthenapplythecrustalgorithmtothesesamplepointstogetthreedimensionalmesh.
简介:Inthispaper,weproposeaparametricmodelingmethodtoreconstructtheHui-Styleandsolvetheproblemthattheusercan’teffectivelyreconstructtheHui-StylethreedimensionalmodelsbecauseofthevariousstyleandcomplicatedstructureofHui-Stylecomponents.ThismodelincludessummarizinganddefiningavarietyofHui-Stylecomponentsparametertypes.Determinetherelationshipbetweentheparameteraccordingtobuildingformulasanddesigntheparametricmodelingprocess.First,setthedepthofplatformasthegivenuservalue.Then,calculatethecomponentpropertiesandthecorrespondingsizeaccordingtothestyleoftheHui-StylearchitecturecomponentsandtheconstraintrelationbetweenHui-Stylearchitecturecomponents.Thisneedsonlyoneparameterthatisneededasthebasicparameterinthismethodandtheentiremodelingprocesscanbeachievedbasedonit.TheexperimentalresultshowsthattheproposedmethodcanwellsolvethecomplexparametersrelationshipoftheHui-StylearchitecturecomponentsandhelpthegeneraluserstoconstructtheHui-Stylearchitecturecomponentsmoreeffective.
简介:Reverseengineeringdealingwithimagesistraditionallybasedonimageprocessingandcontourrecognition.Anewmethodispresentedbasedonthecombinationofsectionalslicingwithimagemosaic.Sectionalcontoursofthetargetobjectaregeneratedbycolorfulliquidorlaserscanning,theseimagesfromdifferentviewsarefusedintoasetofcompletecross-sectionalimages,therebythewholepracticalmodelisreconstructedin3Dspace.