三维复杂形状拼接与破碎物体复原技术研究

《三维复杂形状拼接与破碎物体复原技术研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、西北大学博士学位论文三维复杂形状拼接与破碎物体复原技术研究姓名：周术诚申请学位级别：博士专业：计算机软件与理论指导教师：周明全20070501ABSTRACTShapemacthingiswidelyusedinmanydisciplines，suchasarchaeology,3Dreconstruction,andSOOILNeighboringfragmentswimshapematchingisreassembledtomakebrokenobjectsrestoration．ShapematehingandMosaicingofbrokenobjectsrelate

2、tocomputergraphics，graphicsandimagesfusion,computervisualizationtechnology．Shapefeaturesoffragmentsextractingandrepresenting,shapomatching,mosaicingfragmens，methodsofrepairingelTol瞎techniquesareresearched．Sometechniquesofshapematchingandfragmentsmosaicingarepresented．Themainresearchworksand

3、contributionsaleconcludedasfollows．1．Fragmentsdigitalization,meshsimplification,extractingmeshoutlines，representationofcontourourvesandfeatureareresearched．seg删angMethodBasedOnwaveletWansformadaptivethresholdispI％a疵d2．TwodimensionFouriercontourdescriptors缸multiscal龉arcresearched．Anovel2DcUI

4、'VeSmatchingmethodbasedOnmulfiscaleFourieraL-№riptorsispresent缸Contotu"cul'vcsarcfilteredbyGanssiallfilteratdifferentscale．Eigenvectorsareconsistedofrealand自naagmarypartofFouriertrailsformationcoe伍cientstorealizecontourmatchingandobjectsmosaicingthroughcomparingfeaturevectors．Thisapproachha

5、sadvantageofsimple,accuracyandfastness．3．CurverepresentedbyBsplineisresearched．LocalcoordinatesystemisbuiIttocalculatedirection衄gle．CalculatingmethodofDimctionanglesusedtoconstructeeigenveetorsand3Dcurvematchingalgorithmbasedondirectionanglearepresentedtocompletefragmentsmosaicing．4．Calcula

6、tingmethodofmultiscalewaveletcontourdescriptorsisresearched．MethodsofExtractingcontourcul"vesfeatBresatmulfiscaleandtechniqueofmosaicing3Dfragmentedobjectsbasedonmultiscaleanalysisarepresented．Spatialcontom"curvesa坤transformedbywaveletatallappropriate∞ale．11璩curvaturesaadtorsionsofsmoothedc

7、ontourbywavelettrartsformatascalearecalculated．EigenvectorsisconsistedofCurvataresandtorsions．Contourcurvesmatchingandfi'agmentsmosaicingthroughsimilaritymeasuringalecompleted．Theproblemofmatchingstartingpointbasedonwaveletcontourdescriptorsisresearched．