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Circular tunnel central axis extraction method based on three-dimensional laser point cloud

A technology of three-dimensional laser and extraction method, which is applied in image data processing, instrumentation, calculation, etc., and can solve problems such as low efficiency

Pending Publication Date: 2020-08-11
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

At present, the commonly used methods for deformation monitoring of subway tunnels mainly use conventional instruments such as total stations, profilers, and convergent gauges for monitoring. Although the accuracy is high, the efficiency is low, and it is difficult to realize real-time automatic monitoring of the tunnel as a whole.

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  • Circular tunnel central axis extraction method based on three-dimensional laser point cloud
  • Circular tunnel central axis extraction method based on three-dimensional laser point cloud
  • Circular tunnel central axis extraction method based on three-dimensional laser point cloud

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Embodiment Construction

[0094] see Figure 1-13 , in an embodiment of the present invention, a method for extracting the central axis of a circular tunnel based on a three-dimensional laser point cloud uses only three-dimensional point cloud data to automatically and accurately fit the horizontal central axis; The geometric relationship between surfaces extracts the contour line of the cross section, fits the center of the circular section, and then extracts the central axis, including the following steps:

[0095] a. Use the ground laser scanning measurement system to obtain the 3D point cloud data of the tunnel;

[0096] b. Project the 3D point cloud onto the horizontal plane, and extract the point cloud boundary according to the boundary feature points and the geometric characteristics of the adjacent point cloud;

[0097] c. Rasterize the point cloud boundary, finely extract the point cloud boundary, and then extract the initial horizontal central axis according to the boundary;

[0098] d. Use...

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Abstract

The invention discloses a circular tunnel central axis extraction method based on three-dimensional laser point cloud, and belongs to the technical field of ground laser scanning point cloud data processing. The method comprises the following steps: firstly carrying out the three-dimensional scanning of a tunnel through a three-dimensional laser scanner, and obtaining the three-dimensional laser point cloud of the tunnel; projecting the tunnel point cloud in the horizontal direction, and extracting the point cloud boundary according to the geometrical characteristics of the boundary feature points; rasterizing the boundary of the point cloud for fine extraction, and extracting a horizontal central axis according to boundary points; considering the influence of the conditions of tunnel bending radian, appendages, point cloud missing and the like on the precision of the horizontal central axis, extracting an accurate horizontal central axis by adopting a sliding window robust fitting method; finally, tunnel cross section point clouds are extracted at equal intervals with the accurate horizontal central axis as the benchmark, cross section contour lines are fitted, the circle center is extracted to serve as a tunnel central axis point, the central axis points at all cross sections are sequentially connected, and therefore accurate extraction of the central axis of the circular tunnel is achieved.

Description

technical field [0001] The invention belongs to the technical field of ground laser scanning point cloud data processing, in particular to a method for extracting the central axis of a circular tunnel based on a three-dimensional laser point cloud. Background technique [0002] As an important traffic facility in the city, the tunnel is deformed to a certain extent due to the extrusion of the surrounding soil, the influence of ground objects and geological movements. The comprehensive inspection of it is an important guarantee for the safe operation of tunnel traffic. At present, the commonly used methods for deformation monitoring of subway tunnels mainly use conventional instruments such as total stations, profilers, and convergent gauges. Although the accuracy is high, the efficiency is low, and it is difficult to realize real-time automatic monitoring of the entire tunnel. Three-dimensional laser scanning technology is known as a revolutionary technological breakthrough ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00G06T3/00G06T7/13G06T7/68
CPCG06T7/0004G06T7/13G06T7/68G06T2207/10028G06T2207/30172G06T3/067
Inventor 田茂义徐飞林景峰俞家勇卢秀山
Owner SHANDONG UNIV OF SCI & TECH
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