简介:AnewmethodtotheproblemoffairingplanarcubicB-splinecurvesisintroducedinthispaper.Themethodisbasedonweightedprogressiveiterativeapproximation(WPIAforshort)andconsistsoffollowingsteps:findingthebadpointwhichneedstofair,deletingthebadpoint,re-insertinganewdatapointtokeepthestructureofthecurveandapplyingWPIAmethodwiththenewsetofthedatapointstoobtainthefairedcurve.Thenewsetofthedatapointsisformedbytherestoftheoriginaldatapointsandthenewinsertedpoint.Themethodcanbeusedforshapedesignanddataprocessing.Numericalexamplesareprovidedtodemonstratetheeffectivenessofthemethod.
简介:Inthispaper,wepresentanalgorithmforreconstructionofB-splinesurfacesuchthatitinterpolatesthefourgivenboundarycurvesandsimultaneouslyapproximatessomegiveninnerpoints.Themainideaofourmethodis:first,weconstructaninitialsurfacewhichinterpolatesthefourgivenboundarycurves;then,whilekeepingtheboundarycontrolpointsoftheinitialsurfaceunchanged,werepositiontheinnercontrolpointsofthesurfacewithenergyoptimizationmethod.Examplesshowthatouralgorithmispracticableandeffective.
简介:不需要。只要提供的WindowsXPSP3环境运行在Windows7的Professional、Enterprise或Ultimate版本上,它就会基于所在的Windows7SKU自动激活(这是个好消息)。
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