Contour registration method based on machine-vision contour measurement for train rails

Abstract

The invention discloses a contour registration method used in train guide rail contour measurement based on machine vision. Contour measurement comprises the first step of collecting steel rail images, the second step of obtaining a single-pixel curved line of a steel rail profile through computer processing, the third step of carrying out calibration restoring and the fourth step of carrying out contour registration. The contour registration method comprises the steps of enabling an actual contour line and a standard contour line to be unified in a coordinate system and utilizing asymptotic lines of the two contour lines to obtain an included angle between the actual contour line and the standard contour line, rotating the actual contour line and enabling the asymptotic lines of the two contour lines to be paralleled, and horizontally moving the actual contour line and enabling ends of the actual contour line to be coincident with ends of the standard contour line. According to the contour registration method, the actual contour line and the standard contour line are unified into the coordinate system and the actual contour line is processed, the asymptotic lines of the actual contour line and the standard contour line are paralleled and coincide at ends, and therefore the registration result is accurate, observation and calculation are carried out conveniently and reliable abrasion loss data can be achieved.

Description

technical field [0001] The invention belongs to the field of image-based non-contact automatic measurement, relates to the fields of image processing, laser and optics, computer, and automatic control, and specifically refers to a contour registration method in the contour measurement of a train guide rail based on machine vision. Background technique [0002] As an important carrier in railway transportation, steel rail is one of the most basic units in railway transportation, and its condition directly affects the safety of train operation. Especially when the train is running at high speed, heavy load, and high density, the wear of the rail increases and the service life is shortened, causing great harm to the safety of the train. In the "maintenance regulations" of railway lines, the Ministry of Railways stipulates the limit value of rail head wear for light and serious rail damage, and requires that when the wear of the rail head is detected to exceed the limit value, i...

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Problems solved by technology

[0004] The mechanical contact measurement method is the most widely used method in our country at present. It mainly uses calipers for manual measurement. Low, and it is not convenient for post analysis statistics and archiving

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