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Track fastener fastener looseness detection method adopting depth image

A depth image and track fastener technology, applied in image enhancement, image analysis, image data processing, etc., can solve the problems of poor precision, limited scope of application, low efficiency, etc., and achieve the goal of improving reliability and reducing the accuracy of depth measurement Effect

Pending Publication Date: 2019-12-31
成都精工华耀科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a method for detecting the looseness of rail fastener fasteners based on three-dimensional shape data, which is used to accurately detect whether the fasteners of rail fasteners are loose, so as to solve the problems existing in the existing method for detecting the looseness of rail fasteners. Poor accuracy, low efficiency, and limited scope of application

Method used

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  • Track fastener fastener looseness detection method adopting depth image
  • Track fastener fastener looseness detection method adopting depth image
  • Track fastener fastener looseness detection method adopting depth image

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] This embodiment takes image 3 The illustrated hexagonal bolt is used as an example for explanation.

[0054] Step 1: Use the 3D imaging system to obtain the 3D shape data of the rail fastener, and use the track plane as the horizontal reference plane to convert the 3D shape data into a 2D depth image.

[0055] use figure 2 The shown line structured light scanning 3D imaging system acquires 3D shape data of rail fasteners. Such as figure 2 As shown, the line-structured light scanning 3D imaging system includes a line-structured light projector 1 and an area array camera 2, the positions and angles of the line-structured light projector 1 and the area array camera 2 remain fixed, and the line-structured light projector 1 generates a line structure The light sheet light is projected onto the fastener 4 perpendicular to the rail 3, forming a section profile on the surface of the fastener 4, and the section profile is photographed by the area array camera 2, and the di...

Embodiment 2

[0068] The difference from Embodiment 1 is that in step a-4-2, the average or median value of the depth image pixels in the region R is calculated, or the regular polygon is fitted to the non-zero elements in the region R, and the regular polygon or the regular polygon is extracted. The mean or median value of the depth image pixels within the area of ​​the inscribed circle of the polygon, as the bolt height h′ c , the regular polygon is a regular hexagon.

Embodiment 3

[0070] The difference from Example 1 is that for Figure 4 The quadrilateral bolts shown are processed, and the regular polygon is a square.

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Abstract

The invention discloses a track fastener fastener looseness detection method based on a depth image, and belongs to the field of railway infrastructure detection. The method mainly comprises the following steps: adopting a three-dimensional imaging system to obtain three-dimensional topography data of the rail fastener; taking a track plane as a depth image horizontal reference plane, converting the data into a two-dimensional depth image, firstly extracting a fastener area in the two-dimensional depth image, then calculating the floating height and the rotation angle of a fastener moving partin the fastener area, and judging whether a fastener is loosened or not by comprehensively utilizing the floating height and the rotation angle. The detection method provided by the invention is convenient to use, does not change the structure of the existing railway fastener, can effectively detect the looseness of various types of fastener bolts or nuts, and ensures the safe operation of the railway.

Description

technical field [0001] The invention relates to the field of railway infrastructure detection, in particular to a method for detecting looseness of rail fastener fasteners using depth images. Background technique [0002] The fastener is an important part connecting the rail and the sleeper. Its function is to fix the rail on the sleeper, maintain the gauge and prevent the rail from moving vertically and horizontally relative to the sleeper. Therefore, the fastener plays an important role in ensuring the stability and reliability of the track. play a very important role. Bolts and nuts are the key to ensure that the fasteners are firmly fixed. Once the bolts or nuts float, it will inevitably lead to loosening of the fasteners, which will cause serious safety hazards. [0003] In terms of railway infrastructure testing, my country has long been dominated by manual and static testing, with high maintenance costs, high strength, and poor safety. With the rapid development of h...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/136
CPCG06T7/0004G06T7/136G06T2207/30164
Inventor 左丽玛
Owner 成都精工华耀科技有限公司
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