基于形状的三维模型检索若干关键技术研究

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1、中国科学院计算技术研究所博士学位论文基于形状的三维模型检索若干关键技术研究姓名：刘玉杰申请学位级别：博士专业：计算机应用技术指导教师：李华20060601◆实现了一种三维模型检索预处理方法．针对目前的三维检索系统中常见的二维草图输入方法的局限性，本文假定输3,篚J-维草图是三维模型的三视图，在对三视图采样基础上，实现了三维体素模型的重构，避免了二维草图在检索中产生的重复比较．同时这种处理方法也可以作为三维模型检索系统的输入技术的一种解决方案．关键词：三维模型，U系统矩，扩展距离，球面调和变换，电场力，正交样条矩，二维草

2、图，三维模型检索ⅡResearch佃Some脚TechnologiesofShape-Based3DModelRetrievalLiuYujie(ComputerApplicationTechnology)DirectedbyProfessorLiHuaImprovedmOddingtoolsandscann／ngdevicesaremakingtheacquisitionof3Dmodelseasierandlowefexp簋isive．3Dgraphicshardware锄dCPUshavebecomefastmd

3、cheapmoughth越3Ddata啪beprocessedanddisplayedmorequicklyonPCs．Itleadstollighdemandfor3Dmodelsfromawide加geofSourc嚣．UnderthebackgroundofInternet,3Dmodelretrievalonthebaseofintrinsicpropertiesisproposedinapplicationsof3Dmodel．Itisnewext砌onofcontend-basedimagere仃ieval

4、．Intherese缸chof3Dmodelre缸ieval,thekeyproblelmistogetinvarianceofgeometricumlsgormafionsofrigidb()dies。越thesametimethefeaturev既tofspaceshouldbeeasytobeextended,whichwillfacilitatethemassivemodelretrieval．Duetothecomplexilyof3Dobjects,theacquiredfeaturesshouldconm

5、inadequateinform撕on．砸sdissertationresearchesmainlyinthreeaspects,describingtheshapeof3Dmodel；get五ngtheshapepropeniesof3Dmodels；andindexing3Dmodelsbyusingthedescriptionofi毽shapeprop硎es．Normally,fourstepsareincludedina3Dmodelsretrievalsystem,i．已posenormalization,f

6、eatureextraction,similari哆comparisonandUSerinterface．Thisdissenmionfocusesontheexu'acungmethodofglobalgeomelxicfeaturesof3Dmodelsanditsapplicationsin3Dmodelreuieval．n地maincontributionsofthisdissertationaresummarizedasfollows：Anovel3Dorthogonalpolynormalsmorn吼cal

7、led3DUsyst既nmomentisdefine正andisusedfor3Dmodelretrieval．Asakindofcompleteorlhogonalpolynomialssystem,Usystemhasmanygoodproperties．AccordingtoUsystemtheory．thefastcalculanonofUlsystemmomentsisestablished．Anovelfeatureveaor-既tendeddistanceispressed．Itisobtainedbyf

8、ormingasphericalfunctionofmaximumdistanceOffthesurfaceofthemodel．Then,sphericalharmonictransformisusedonthesph能11leenergyofthecoefficientsofsphericalharmonicsformsthe