Railway track semi-automatic detection method based on integration of reflection intensity and geometric features

A technology of reflection intensity and railway track, applied in the direction of measuring devices, instruments, optical devices, etc., can solve the problems of low correct rate and accuracy of railway tracks, difficulty in automatic extraction, lack of wide applicability, etc., and the method is simple , Fast and robust semi-automatic extraction, easy to achieve effect

Active Publication Date: 2017-03-15
WUHAN UNIV
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Problems solved by technology

[0004] In general, there are still problems in quickly and accurately extracting railway tracks from large-scale laser scanning data: 1) The calculation of local geometric features is sensitive to point density changes, noise, etc., resulting in low accuracy of feature calculation; 2) Railway track The correct

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  • Railway track semi-automatic detection method based on integration of reflection intensity and geometric features
  • Railway track semi-automatic detection method based on integration of reflection intensity and geometric features
  • Railway track semi-automatic detection method based on integration of reflection intensity and geometric features

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[0040] The technical scheme of the present invention uses computer software to support the automatic operation process, and the process is as follows figure 1 Shown. The technical scheme of the present invention will be described in detail below in conjunction with two embodiments (one piece of vehicle-mounted laser scanning data, one piece of airborne laser scanning data) and the drawings. Two implementation examples carry out railway track point cloud extraction according to the designed scheme, and the detailed instructions are as follows:

[0041] Step 1. Calculate the local geometric characteristics of each laser foot point in the laser scanning data of the railway track. The local geometric characteristics are the main direction and normal vector of the neighborhood point distribution of the laser foot point.

[0042] For any laser foot point pt, its local geometric feature calculation is realized as follows:

[0043] Step 1.1: Parameter initialization

[0044] Initialize the ...

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Abstract

The present invention discloses a railway track semi-automatic detection method based on the integration of the reflection intensity and geometric features. The method comprises the steps of 1, respectively calculating the local geometric features of each laser footprint in laser scanning data, wherein the local geometric features are composed of the main direction and the normal vector of the neighborhood point distribution of the laser footprint; 2, conducting the point cloud clustering based on the reflection intensity and the local geometric features and extracting the point cloud of a railway track. According to the technical scheme of the invention, the semi-automatic extraction for the point cloud data of the railway track can be quickly and robustly achieved. Therefore, the extraction accuracy, the extraction efficiency and the automation degree of the point cloud data of the railroad track is improved. Moreover, the method is simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field of intelligent processing of laser scanning data, and in particular relates to a semi-automatic detection method of a railway track which combines reflection intensity and geometric features. Background technique [0002] Railway is an important infrastructure of the country and plays a key role in the comprehensive transportation system. At present, in railway track surveying, conventional surveying and mapping techniques mainly use ground surveying instruments such as total stations and levels, or optical aerial photogrammetry, close-range photogrammetry and other means. These methods have a large workload in the field, low degree of automation, and low work efficiency. , The long production cycle is difficult to meet the requirements of the current railway survey for the extraction of railway thematic elements, the cycle of drawing and the accuracy. Vehicle-mounted and airborne laser scanning technology ...

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Application Information

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IPC IPC(8): G01B11/00
CPCG01B11/00
Inventor 杨必胜董震刘缘刘洋邹响红
Owner WUHAN UNIV
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