Image restoring method in train guiderail contour measurement based on machine vision

A technology of machine vision and contour measurement, which is applied in the direction of measuring devices, instruments, and optical devices, etc. It can solve the problems of large influence of human factors, low efficiency, inconvenient analysis, statistics and archiving, etc., and achieves fast image acquisition speed and convenient data management. , Convenience effect

Inactive Publication Date: 2015-10-28
成都多极子科技有限公司
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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

Method used

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  • Image restoring method in train guiderail contour measurement based on machine vision
  • Image restoring method in train guiderail contour measurement based on machine vision
  • Image restoring method in train guiderail contour measurement based on machine vision

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Embodiment Construction

[0030] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] like figure 1 As shown, the train guide rail wear measurement system irradiates a narrow line laser on the surface of the train guide rail to be tested to form a thin and narrow light strip, and the light strip is captured by the CCD camera to obtain the profile image of the train guide rail and is transmitted to the computer image processing system for processing. The profile image After image processing such as filtering, binarization, thinning, and center extraction, a single-pixel curve is obtained. In order to obtain a full picture of the outline of the train guide rail illuminated by the line laser, the optical axis of the CCD camera and the plane where the outline of the train guide rail are located cannot be perpendicular, so the light strip image is distorted. In order to obtain the light strip image ...

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Abstract

The invention discloses an image restoring method in train guiderail contour measurement based on machine vision. The image restoring method comprises the steps of S1, placing a calibration plate, namely placing the calibration plate on a train guiderail so that a laser irradiates the surface of the to-be-detected train guiderail for forming a thin and narrow light stripe, arranging the calibration plate on the light stripe so that the calibration plate is superposed with the stripe of the light stripe; S2, obtaining a calibration image, namely connecting with a CCD image camera, and obtaining a section contour image of the train guiderail under laser irradiation when the image of the calibration plate in a laser plane appears in a viewing window; and S3. performing calibration restoring on an obtained single-pixel curve for obtaining the actual contour of the train guiderail. According to the image restoring method, calibration restoring processing is performed on the contour; and the information of an image in an actual three-dimensional space is restored according to a two-dimensional image model which is acquired by the CCD image camera through computing, thereby eliminating distortions, restoring the actual contour and making a computing result more accurate and more reliable.

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 an image restoration 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, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/24
Inventor 余学才张行至张利勋周建华
Owner 成都多极子科技有限公司
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