Size Measuring of the End Surface of Turnout Rail Parts Based on Machine Vision

In order to solve the measurement error, low efficiency and poor consistency problem in traditional contact measuring on the measuring of end surface of turnout rail parts size, a method which was based on machine vision to realize the non-contact type size measurement was provided. Firstly, appropriate industrial CCD and camera lens suitable for the actual situation of the end surface of turnout rail parts black and white image was acquired assisting with the forward illumination light, Secondly, the contour of the end surface in the image was extracted joining with mathematical morphology and dynamic threshold, Lastly, the actual size of rail end was got combined with the result of the camera calibration. The experimental results show the method can obtain the more precise value in the size measurement of the end surface of turnout rail parts.