Abstract: A non-contact measurement system of wire ellipticity, where three cameras are used, is designed in the laboratory environment, which can be used to simulate the high-speed wire ellipticity monitoring in the industrial field. First, the real-time images of wire rod are collected by using bilateral telecentric lens, collimating light source and high-speed area array CCD industrial camera, and the camera is calibrated and distortion-corrected . Then the real-time images collected by the three cameras are preprocessed in turn, and a method of adaptive Ψ-value motionblur image restoration is proposed. Finally, the wire diameter measured by three cameras is calculated by the points on two lines detected by Hough transform, and then the wire ellipticity is calculated by using the diameter. The results show that the measurement accuracy of the system under the laboratory conditions can meet the accuracy required in the actual industrial production , and it is expected to be put into use in the high-speed wire production line.

Key words: bilateral telecentric lens, Hough transform, ellipticity, motion blur processing, area array CCD