Fig. 1. Schematic of slab detection system. (a) Side view; (b) top view

Fig. 2. Schematic of binocular structured light measurement system

Fig. 3. Measurement system of rail bearing platform

Fig. 4. Binocular stereo vision measurement model

Fig. 5. Point cloud data of rail bearing platform

Fig. 6. Point cloud data extraction. (a) Sum of Z coordinates of each contour; (b) Spearman rank correlation coefficient; (c) contour extraction effect of rail bearing platform profile; (d) Z coordinates of single rail bearing platform contour profile; (e) Spearman rank correlation coefficient; (f) data extraction effect of clamp surface and bearing surface

Fig. 7. Extraction effect of point cloud data of rail bearing platform

Fig. 8. Calculating distance of single rail bearing platform jaw. (a) Determination of intersection point of single contour; (b) spatial straight line fitting

Fig. 9. Calculation of center distance between two neighboring casings of same bearing surface. (a) Monocular sensor point cloud data; (b) binocular sensor point cloud data; (c) filtered point cloud data

Fig. 10. Measurement error of binocular structured light system. (a) Measurement error of bearing surface slope; (b) measurement error of angle between rail bearing surface and jaw surface; (c) measurement error of jaw distance of single rail bearing platform; (d) measurement error of center distance of adjacent casings

Table 1. Testing standard of rail bearing platform parameters

Table 2. Measurement results of binocular structured light system