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Denoising of tunnel point cloud data based on ellipse fitting
Author(s): 
Pages: 69-72+81
Year: Issue:  9
Journal: Geotechnical Investigation & Surveying

Keyword:  minimum bounding boxespoint cloud slicingellipse fittingpoint cloud denoising;
Abstract: In view of the special characteristic of the subway tunnel section and its long shape,a method for removing point cloud noise of the tunnel is presented.This method firstly determines the direction of the tunnel axis through the establishment of a minimum bounding box,secondly using the projection of tunnel point clouds segment to get the point cloud slices and fitting the points on the slices to the ellipse,finally identifies and removes the noise whose shifts are more than the thresholds of fitting standard deviation.The proposed method is rather simple and can be easily implemented.A case study is provided to illustrate its feasibility and efficiency.
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