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A photogrammetry method for railway track direction detection

A railway track and photogrammetry technology, which is applied in photogrammetry/video metrology, surveying devices, surveying and navigation, etc., to achieve the effect of less splicing times, less processing, and a wider field of view

Inactive Publication Date: 2019-01-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it needs to be further improved in terms of distribution density of detection points and measurement efficiency.

Method used

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  • A photogrammetry method for railway track direction detection
  • A photogrammetry method for railway track direction detection
  • A photogrammetry method for railway track direction detection

Examples

Experimental program
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Embodiment Construction

[0045] see figure 1 , during measurement, the rail inspection trolley 1 is placed on the railway track 2, and the rail surface camera 3 is placed at the front end of the rail inspection trolley and forms a fixed angle θ with the rail surface (according to the height of the camera from the rail surface, θ is generally selected from 50 degrees to between 80 degrees to ensure that the rail image acquired by the rail surface camera is guaranteed to be within the range of 5 to 8 meters), the pulse signal emitted by the photoelectric encoder 4 controls the rail surface camera 3 and the rail side camera 6 to carry out image acquisition, so that the collected The image corresponds to an exact physical location. The rail surface camera 3 acquires a monorail image with fixed geometric distortion (since the height and angle θ between the camera and the rail surface are fixed, and the parameter settings of the camera are also fixed, so the distortion of the monorail image is also fixed). ...

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Abstract

The invention discloses a photogrammetry method for railway track direction detection. As the rail inspection car moves forward, the track surface camera collects single-track images with fixed geometric distortion at certain distances, and performs geometric correction, matching, and splicing on the images to obtain a two-dimensional long rail image. Edge detection can initially obtain the inner edge of the long rail. The linear structure light source emits a laser plane from the direction perpendicular to the longitudinal axis of the rail. The laser plane forms a light bar curve on the surface of the rail that can reflect the contour characteristics of the rail. The rail-side camera captures the light bar curve at intervals. The images acquired by the rail-side camera are subjected to light stripe thinning, rail contour restoration and rail contour matching, and the fat edge value of the rail profile is calculated. According to the calculated fat edge value, the inner edge of the long rail at the corresponding position is compensated, thus obtaining The inner edge of the long rail 16mm below the rail surface. According to the inner edge of the long rail, two-dimensional coordinates are established to obtain the coordinates of each point on the edge, and the track direction of any chord length anywhere on the railway track can be calculated.

Description

technical field [0001] The invention relates to a photogrammetry method for rail direction detection of railway tracks. Background technique [0002] With the rapid development of my country's railway transportation, ordinary railway speed-up and high-speed railway construction have become important means to improve railway transportation capacity. Among them, high-speed railway has become an important part of my country's transportation with its advantages of fast and comfortable, large carrying capacity, low-carbon and environmental protection. The improvement of train running speed puts forward stricter requirements on track smoothness. During the long-term operation of high-speed trains, due to the repeated action of wheels and rails and the influence of many factors such as settlement, the railway track is prone to geometric deformation. If the track smoothness is not up to standard, it will damage the track and rolling stock components, and reduce the service life of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C11/00G06T3/00G06T7/13
CPCG01C11/00G06T3/147
Inventor 余明杨朱齐果韦森黄小雨
Owner CENT SOUTH UNIV
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