Measuring Railroad Wheel Profiles through Image Processing Technology

J. Figueiredo (Portugal)


Metrology, Wheels Profile, Plane Transformations, Image Processing, Camera Calibration


In this paper an image processing system is presented, to provide for the measurement of railroad wheel profiles. The wheel profile is acquired by the illumination of the wheel through a secant and horizontal light plane. The profile image is processed by identifying the line of the greatest light gradient in the whole image. This gradient profile is then converted to the wheel radial profile by means of a coordinate transformation model, which transforms the image plane into the wheel radial plane. A 1:1 scale prototype was built and the developed method was tested delivering very accurate results.

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