关键词: 机器视觉, 连铸方坯, 多线程并行处理, 定尺切割

Abstract: Because of low-accuracy and easy-damage of the contact definite-length measurement, a non-contact continuous square billet online definite-length cutting system was designed based on machine vision. Through regular image capture, preprocessing and length calculation, the computer could calculate the length of the square billet on-line. For the definite length, the computer would send a cutting signal to the PLC, then the PLC would control the cutting machine, and the square billet could be cut to a definite length. At the length calculation stage, a forward contourtracking algorithm was presented by tracking the upper edge pixels, which could track the head of the square billet and accurately calculate the length. In addition, the multi-threading parallel process technique was applied, which could greatly reduce the runtime of the program. Experimental results show that this system can achieve the goals of realtime, stabilization and highaccuracy.

Key words: machine vision, continuous square billet, multi-threading parallel process, definitelength cutting