Method and device for measuring catenary geometric parameters by using scale factor and frame difference

Abstract

The invention provides a method and a device for measuring the geometric parameters of an overhead line system by using scale factors and frame differences. Selected measuring bases are calibrated by using the method based on scale factors, so that calibration can be performed under a low scale and real-time measurement under an actual scale can be achieved by adding proper scale factors under the actual scale; the frame difference method is employed to perform image collection on image frames with laser and image frames without laser, perform margin calculation and select a proper threshold value to extract laser light spots; homography transformation in computer vision is employed to transform coordinate points on an imaging plane of a camera to a detection plane formed by linear laser via matrix operation, wherein each point on the imaging plane of the camera corresponds to a group of high-speed train overhead line system geometric parameters; thus the conductor height and stagger value can be measured at the same time on the detection plane. The method of acquiring parameters has the advantages of simplicity, fewer introduced parameters and high accuracy and can reduce error greatly.

Description

technical field [0001] The invention relates to the technical field of electrified railway power supply. More specifically, the present invention relates to a method and device for measuring catenary geometric parameters by using scaling factor method, frame difference and homography transformation in computer vision. Background technique [0002] In the electrified railway power supply system, the catenary is the transmission line erected along the railway line to supply power to the electric locomotive, and the catenary wire is the wire that supplies power to the electric locomotive. In order to ensure good contact between the contact wire and the pantograph of the electric locomotive, the geometric parameters of the contact wire must be set accurately, among which the most important parameters are the conduction height and pull-out value of the contact wire. The guide height of the contact line is the vertical height from the contact line to the rail, and the pull-out va...

AI Technical Summary

Problems solved by technology

[0014] The purpose of the present invention is to provide a method and device for measuring catenary geometric parameters by using the scale factor and frame difference, so as to solve the problem that the existing method cannot recognize the laser spot from the image stably, efficiently and accurately, and combine the coordinates on the image with the The process of corresponding the guide height and pull-out value of the contact wire is complex, involves many parameters, has large errors, and has a large delay, which is not suitable for continuous real-time measurement.

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