From the characteristic of converter steel-making processes, a digital video monitoring
system for steel-making plants was developed. The key technologies of this system, such as
multicast technology, communication and synchronization technologies of multithreads were
discussed. In this system, the real-time processing of flame images gathered is carried out for real-
time control of the steel-making process. Its application result shows that the system meets the
needs of steel-making process monitoring.