A novel way to process light-section image of wheel set outline based on B-spline function

In order to eliminate the shot noise and extract precise wheel contour line in online dynamic detection system for locomotive, threshold denoising method and smooth spline fitting are proposed in the paper. Furthermore, cubic B-spline interpolation is used to do subsequent processing on the principal curve. Before math processing on the curve, in advance the light-section image pixels are transformed into data points in rectangular coordinates to ensure higher precision of the wheel outline curve. Experimental results show that methods to process light-section image of wheel outline based on B-spline function is able to provide measurement data with higher precision when monitoring abrasion of key parts on wheel set.