Realtime calculation of dispersed materials dynamic position in scrap nonferrous metal sorting

WANG Qiao1, YE Wenhua1, XIONG Tianzhong1, HUANG He1, HUANG Jiansheng2, LU Jianfeng2

(1.College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing
210016, China; 2.Jiangsu Huahong Technology Stock Co., Ltd., Jiangyin 214423, China)

Abstract: Aiming at the problem of calculation of materials dynamic position in scrap nonferrous metal sorting, an improved algorithm based on the shape center algorithm of binary image was proposed to ensure the accuracy and efficiency of position calculation. The scrap nonferrous metal sorting based on Xray transmission technology was analyzed, image processing technology was used to process the detection data. Considering nonferrous metals materials had the characteristics such as differences in shape, size and attitude, high speed, high precision connected components labeling was adopted and an improved method was proposed based on the shape center algorithm of binary image. The shape centers of multiple objects could be calculated by scanning the image for once when the connected components labeling was completed. The problem of the detection data of the same material was divided into two images can also be solved and the position of nonferrous metals materials could be calculated eventually. The results of experiment show that the algorithm can calculate the position of the nonferrous metals materials quickly and accurately, the accuracy of the algorithm can reach 92.3% and the average running time is 30.3ms per image.

Key words: scrap nonferrous metal; sorting; image processing; position calculation