A method for segmenting point cloud data of a shield tunnel surface
A technology of shield tunneling and surface points, applied in image data processing, 3D image processing, instruments, etc., to simplify calculations and improve fitting accuracy
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[0022] A method for segmenting surface point cloud data of a shield tunnel, comprising the following steps:
[0023] (1) Shield tunnel point cloud projection: According to the overall direction of the shield tunnel point cloud, select XOY, YOZ, or XOZ Two of the surfaces are used as projection surfaces to convert the 3D point cloud into 2D and simplify the calculation;
[0024] (2) Boundary point extraction: Grid the projected two-dimensional point cloud in the plane, and use the grid to extract the upper and lower boundary points of the point cloud;
[0025] (3) Calculation of tunnel point cloud segmentation position:
[0026] a) Calculation of the tangent slope of the extracted boundary points: fit the boundary neighborhood of the shield tunnel point cloud, and calculate the slope by deriving the fitting function;
[0027] b) Segmented position calculation: establish a K-X coordinate system with the tangent slope as the vertical axis, and perform fitting analysis on the ta...
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