变窗口均值限差法的点云噪声滤除方法  

A noise filtering method based on mean tolerance processing with variable window

作　　者：刘文龙[1] 王晓龙[2] 赵小平[1] 

机构地区：[1]北京工业职业技术学院,北京100042 [2]北京市测绘设计研究院,北京100038

出　　处：《测绘科学》2014年第10期93-97,共5页Science of Surveying and Mapping

基　　金：北京市属高校创新团队(IDHT20130511);北京市科技创新平台(PXM2013_014225_000051);青年拔尖人才培育计划(CIT&TCD201304063);北京市优秀人才培育资助

摘　　要：利用三维点云数据建模的准确与否很大程度上依赖于点云滤波效果的好坏,通过对滤波方法的研究,可以提供尽量准确的地面点云数据。文章利用C#高级编程语言,结合OpenGL三维图形库对三维激光点云数据进行噪声滤波处理;将三维激光点云投影到格网内的拟合平面上,通过变窗口均值限差法对高差、坡度关键参数进行了分析对比,确定出合适滤波参数,模拟表达实际地形的原貌。实验证明,变窗口的均值限差法可以滤除绝大部分噪声,对于紧邻地面的部分噪声,可以通过进一步拟合最小二乘曲面或加入先验信息等方法去除。该方法不仅能够有效去除噪声,而且还能较大程度地保留地形的特征信息。The accuration of 3Dpoint cloud modelling largely depends on point cloud filtering effect,and the selection of filtering methods can provide accurate ground data.In this paper,C#language and OpenGL 3Dgraphic library were used for noise filtering.Three-dimensional laser point cloud was projected to the fitting plane in grid,and the key parameters of elevation difference and slope were compared by mean tolerance method with variable window to determine the appropriate filter parameters,by which the actual terrain was simulated.Experimental results showed that most noise could be removed and some ground noise could be also removed by least squares surface fitting or adding priori information,meanwhile,terrain feature information could be maintained.

关 键 词：地面三维激光 噪声滤除 变窗口 OPENGL 

分 类 号：P232[天文地球—摄影测量与遥感] TP751[天文地球—测绘科学与技术]