Linear array scanning image sleeper positioning and counting method based on gradient projection

A technology of line scan and gradient projection, applied in image data processing, image analysis, image enhancement, etc., can solve the problems of low precision and poor reliability, and achieve the effect of less image data, easy storage and management

Active Publication Date: 2018-11-20
成都精视华耀科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a railway sleeper positioning and counting method for high-precision mileage counting in rail transit automatic inspection systems to solve the problems of low precision and poor reliability in existing mileage counting methods

Method used

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  • Linear array scanning image sleeper positioning and counting method based on gradient projection
  • Linear array scanning image sleeper positioning and counting method based on gradient projection
  • Linear array scanning image sleeper positioning and counting method based on gradient projection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The linear array imaging system is used to scan and image the track pavement along the moving direction of the train or detection platform, and obtain 20 linear array images including sleepers.

[0059] Schematic diagram of the line array imaging system figure 2 As shown, it is composed of line light source 1 and line array camera 2, located directly above the railway, the projection plane of line light source 1 and the imaging plane of line array camera 2 are coplanar, and the projection direction of line light source 1 and the optical axis of line array camera 2 are perpendicular to the railway road surface .

[0060] The line light source 1 is a narrow-band light source with a wavelength a, and a narrow-band filter with a wavelength a is set at the front end of the line array camera 2 to eliminate ambient light interference, and the wavelength a=500nm.

[0061] The imaging controller is composed of a photoelectric code disc or a photoelectric encoder fixed on the w...

Embodiment 2

[0080] Replace step 3 in Example 1 with: for 3 horizontal projection curves {S 1 ... S 3} Fusion by means of cumulative multiplication to obtain the joint projection curve S′, the result is as follows Figure 9 As shown, the specific formula of the cumulative multiplication operation is:

[0081]

[0082] Among them, S′(i) represents the value of the i-th element in the joint projection curve S′, S k (i) represents the kth horizontal projection curve S k The value of the i-th element in , K is the number of joint projection curves, Π represents the multiplication operation, and N is the height of the detection area.

[0083] All the other steps are the same as in Example 1.

Embodiment 3

[0085] Steps 4-6 in Embodiment 1 or 2 are replaced successively by:

[0086] Step 4: Extract the trough in the joint projection curve S′, and obtain the number of troughs and coordinates

[0087] First, the joint projection curve S′ is divided into several negative square waves by using the fixed threshold method, and the trough is found by the minimum value method in the negative square wave area, and the result is shown in the figure Figure 10 shown.

[0088] Step 5: Take the paired valley coordinates in the joint projection curve S' for sleeper positioning.

[0089] The trough pairing method is: when the value of the first m / 2 row elements in the differential operator is greater than 0, from the top to the bottom of the line scan image, pair them in the order of the trough; when the value of the first m / 2 row elements in the differential operator is less than When 0, from the top to the bottom of the line scan image, pair them in the order of troughs.

[0090] Step ...

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Abstract

The invention discloses a linear array scanning image sleeper positioning and counting method based on gradient projection and belongs to the field of rail detection. The method comprises a step of performing linear array scanning imaging on a track pavement along the forward direction of a train or a detection platform by using a linear array imaging system to obtain a line array image includingsleepers, a step of performing gradient filtering perpendicular to a sleeper direction on the line array image to obtain a gradient filtering image, a step of setting a detection area in a sleeper area of the gradient filtering image, carrying out gradient projection in a direction parallel to the direction of the sleepers in the detection area to obtain a gradient projection curve, and a step ofdetecting the positions and numbers of peaks or troughs in the gradient projection curve, taking paired peaks and troughs for sleeper positioning, and calculating the sum of the numbers of peaks or troughs in the line array image to be the number of sleepers in a track. According to the method, after positioning and counting the sleepers, the high-precision mileage counting can be achieved, accurate position information is provided for a track inspection system, the accurate positioning of a track inspection result and quick search in later maintenance are facilitated.

Description

technical field [0001] The invention relates to the technical field of track inspection, in particular to a gradient projection-based line scan image sleeper positioning and counting method. Background technique [0002] Rail transportation includes ordinary railways, high-speed railways, subways, etc., and plays an important role in the development of the national economy and people's daily life. In order to ensure the safety of rail transit operation, the rail transit operation department needs to conduct regular inspections on rail safety. Specific inspection contents include: rail geometric parameter detection, abnormal detection of rail fasteners loose, missing, cracks, etc., rail wear detection, pantograph-catenary line detection, foreign object detection on the road surface, etc. [0003] At present, the detection of rail geometric parameters mainly uses inertial navigation system and laser image measurement system for automatic detection of track geometric parameter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/00B61K9/08
CPCG06T7/0004G06T2207/20024G06T2207/10004G06T2207/30242G06T2207/30108B61K9/08
Inventor 不公告发明人
Owner 成都精视华耀科技有限公司
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