Research on coal gangue size calibration based on perspective correction-parameter calibration synergy

Abstract

The size calibration of coal gangue can help to determine the size range of coal gangue, which has a great influence on the grabbing strategy of coal gangue in the process of coal gangue sorting. However, at present, the size calibration of coal gangue has not been effectively studied. Based on this, this paper innovatively proposes a gangue size calibration method based on perspective correction-parameter calibration. Firstly, a coal gangue image acquisition and processing system was built to collect coal gangue images and preprocess the images. Secondly, the size calibration system model is established, including mathematical model and operation model. Finally, the influence of different heights and tilt angles on the accuracy and stability of the size calibration results were compared. The results show that when the camera height and the coal gangue height are 600 mm and the camera is perpendicular to the ground, the calibration accuracy and stability are the best, and the accuracy rate is more than 97 %. The research content of this paper provides theoretical support for the accurate positioning and precise sorting of coal gangue in the process of belt transportation.