Use of automatic image processing for monitoring of welding processes and weld inspection Eckelt, B.; Meyendorf, N.; Morgner, W.; Richter, U. Proceedings of the 12th World Conference on Non-Destructive Testing, Amsterdam (Netherlands) 23–28 Apr. 1989, Vol. 1, pp. 37–41. Edited by J. Boogaard and G.M. van Dijk, Elsevier, 1989