三维点云多尺度等值线模型Morphing变换方法研究
Multi-scale Contour Model Transformation of 3D Point Cloud Based on Morphing Technology
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摘要: 借鉴Morphing技术思想,提出了一种三维点云多尺度等值线模型Morphing变换方法。首先,分析了三维点云的空间分布情况,并按一定间隔在某一坐标轴方向(如犣轴)将其分层,建立点云的分层模型,以分层点云为单元生成等值线。其次,以分层数据生成的凸包多边形作为最小尺度等值线折线,按一定准则将剩余的离散点集归类到对应的凸包边,引入尺度参数狋,通过计算离散点的选取时机参数对其进行选取,生成连续变化的中间尺度等值线折线。最后,将等值线折线拟合成平滑曲线,构成三维点云的多尺度等值线模型。结果表明,本文方法能够处理规则点云数据和散乱点云数据,生成的等值线符合一般等值线的特性,不会产生边缘交叉等问题,而且运算效率高。Abstract: Anewmulti scalecontourmodelmorphingtransformationmethodof3Dpointcloudispro posedbydrawingonmorphingtechnology.First,thespatialdistributionof3Dpointcloudisanalyzedandslicedwitharegularintervalinsomeanaxisdirection(likeaxis犣).Apointcloudstratifiedmodeliscreatedandstratifiedcontoursareextractedbytakingstratifiedpointcloudastheunits.Then,thestratifiedconvexpolygonsconstructedwithstratifieddatasetsareactedastheminimalscalecontourbrokenlines,andtheremainingunorganizedpointsareclassifiedtothecorrespongdingconvexedgesbyacertainlaw.Introducingthescaleparametertandcalculatingtheselectiontimeparametersofpoints,continuoustransformingmediumscalecontourbrokenlinesareconstructed.Finally,smoothstratifiedcontoursaregainedbyfittingstratifiedcontourbrokenlines,andthemultiscalecontourmodelsof3Dpointcloudarepresented.Twoexperimentsdemonstratethatthemethodproposedinthispapercandealwiththeorganizedpointcloudandtheunorganizedpointcloud.Thegainedcon toursconformwiththenaturesofcommoncontourandwillnotresultintheproblemofintercrossontheedge.Meanwhile,themethodrunsquickly.