網(wǎng)格模型特征識別與曲面重構(gòu).pdf

1、浙江大學(xué)碩士學(xué)位論文網(wǎng)格模型特征識別與曲面重構(gòu)陳飛舟學(xué)科(專業(yè))：計算機應(yīng)用技術(shù)指導(dǎo)教師：葉修梓教授計算機科學(xué)與技術(shù)學(xué)院2006年3月浙5工大學(xué)碩士學(xué)位論文AbstractReverseEngineering(RE)，asamethodofproductdesigningandmanufacturing，hasbeenpaidmoreandmoreattentionsbythewholeworldduringlast90’SWithth

2、edevelopmentofcomputerscienceandmeasuretechnique，ithasalreadybecomeasakeywayofnewproductdesigningandadvancedtechniqueabsorbingSurfacereconstructionaimingtoachievethemathematicalexpressionofgeometricmodelforcomplexfreefor

3、msurfacefromthescattereddata，isakeytechniqueofReverseEngineeringMajorcommercialCADsoftwaretakesNon—UniformRationalBSpline(NUPd3S)asmainexpressionpresentlyThroughstudyingonthesurfacereconstructionuponrandomlysampledpoints

4、，improvedsurfacefittingmethodsareputforwardinthispaperaimingattrianglemeshWeexplainthewaysofsurfacereconstructionindetails，includingquadricsurface，extrudedsurface，revolvedsurfacearidfree—forrnsurfaceLeast—squaremethodisw

5、idelyusedtogeneratequadricsurfaceatpresent，buttheefficiencyofitislowbecauseofitsnon—collinearWiththehelpofGaussianimage，weproposeamethodherethatdenoisethemeshmodelfirst，thenextracttriangleswhichmakeupofthesurfacefeature，

6、finallywereconstructthedemandedsurfaceTheexamresultsshowthatthisapproachisavailableandefficientExtrudesurfaceandrevolvedsurfacearealsocommoninReverseEngineeringThekeyofalgorithmistoextractextrudingdirectionorrevolveaxisd

7、irectionBasedondeepanalyzingonGaussianimage，wegettheextrudingdirectionmagicallyAlso，wegaintherevolveaxisdirectionaccordingtoitsprimarydirectionsFree—formsurfacefittingisahotspotinRETheresultsofconstructingsurfacedirectly

8、uponrandomlysampledpointsarealwaysunacceptableInthispaperwetrytoformordered(mn)pointsaccordingtothemeshmodel，thenwefitthegivenorderedpointsExperimentsshowthattheresultsaremuchbetterKeywords：ReverseEngineering；TriangularM