Research on 3-D vision measurement technology based on line structured light rotating scanning and laser stripe repair

Non-contact 3-D vision measurement is widely used in industrial manufacturing quality inspection. Aiming at the application scenario of industrial metal parts detection, a 3-D vision measurement scheme based on line structured light rotating scanning and laser stripe repair was proposed. Firstly, through the computer vision technology based on line structured light projection, the line structured light rotating scanning vision subsystem was designed, and the industrial camera, line structured light plane and rotating scanning central axis were calibrated; Then, aiming at the problem of missing data in the low gray area of the collected laser stripe image, a laser stripe center line extraction algorithm based on adaptive gray enhancement of the missing area was proposed, which effectively repaired the line structured light projection stripes of the tested parts; At the same time, using the line structured light 3-D vision measurement scheme proposed in this paper, the accuracy of the measurement system was evaluated by reconstructing the surface point cloud of the standard bat and calculating the diameter and spacing of the two balls. The accuracy of the measurement system was better than 0.06 mm; Finally, the shape of the outer contour of the metal hub was measured, and the maximum radius of the outer contour of the hub was calculated through the repeatability experiment. It is verified that the repeatability error is better than 0.03%. The experimental results show that this method can realize the 3-D measurement of industrial metal parts without damage, high efficiency and high precision, and make up for the defects of the contact 3-D measurement method.