Abstract:In order to realize the automatic identification of the model of the car hub under random mixed flow on the roller, a hub recognition algorithm based on ring projection feature was proposed, which was not affected by the angle and position change of hub. Firstly, the radius of each type of hub and its ring projection feature were extracted as templates, then the center of gravity of the matched image was obtained to approximate the hub’ s center of gravity, and the real center and radius were determined by analyzing the ring projection value of each point nearby. Rough matching between hub radius and ring projection and template was used to screen out the mismatched models. Finally, by comparing the radial projection, the model with the highest similarity score was returned. The experimental results show that the algorithm has high stability and realtime performance, and the recognition speed is 1/2 s.