| 面向NURBS曲线构建的切片技术研究 |
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| 引用本文： | 张甜田,王晏民,石宏斌.面向NURBS曲线构建的切片技术研究[J].北京建筑工程学院学报,2012,28(3):29-32,38. |
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| 作者姓名： | 张甜田 王晏民 石宏斌 |
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| 作者单位： | 北京建筑工程学院现代城市测绘国家地理信息局重点实验室,北京,100044;武汉大学测绘遥感信息工程国家重点实验室,武汉,430072 |
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| 基金项目： | 北京市属高等学校人才强教深化计划“高层次人才资助计划”项目，北京市自然科学基金重点项目B类 |
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| 摘 要： | 激光点云数据NURBS曲线曲面重构一般采用参数化方法时,要求数据点是按照特殊规则排列的,即链式曲线和曲面网格.如果被测点是不规则空间排列,运用参数化方法会非常困难,拟合曲面可能会扭曲的很厉害.针对该问题,本文利用切片技术对散乱点进行曲线重建,首先采用曲率分析方法确定切片方向,然后以一定厚度的一系列平行平面与点云求交,对"相交点集"排序,再由参数化方法进行NURBS曲线重构.经实验验证,该方法在NURBS曲线重构中具有高效率性和计算稳定性.
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| 关 键 词： | 散乱点云 切片 NURBS曲线重构 |
Research on Constructing Slice Technology of NURBS Curve |
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| Zhang Tiantian,Wang Yanming,Shi Hongbin.Research on Constructing Slice Technology of NURBS Curve[J].Journal of Beijing Institute of Civil Engineering and Architecture,2012,28(3):29-32,38. |
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| Authors: | Zhang Tiantian Wang Yanming Shi Hongbin |
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| Affiliation: | 1.Modern Urban Surveying Key Laboratory of National Administration of Surveying Mapping and Geoinformation,BUCEA Beijing 100044; 2.Wuhan University State Key Lab of Information Engineering in Surveying,Mapping and Remote Sensing,Wuhan 430079) |
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| Abstract: | In general,the parametric method to reconstruction NURBS curve and surface based on laser point cloud is used,but this method requires point cloud with special rules,such as chain curve and surface grid.If the point cloud is messy,it will be difficult to use this method and the fitting surface may distort it badly.To solve this problem,the slicing technology to reconstruct the curve of point cloud is used in the paper.First of all,the curvature analysis method is used to determine the direction of section,and the point cloud with a certain thickness of a series of parallel planes is intersected.Thirdly,the ＂intersection point set＂ is sorted out.At last,the parametric method is used to reconstruct NURBS curves.From the results of experiment,this method has efficient rate and calculation stability in reconstruction of the NURBS curve. |
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| Keywords: | scattered point cloud slices reconstruction of NURBS curve |
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