Three Dimensional Profile Measurement System for Tunnel Surface Using 1.3 Mega-pixels High Speed Image Processing Camera

There are high demands in the railway industry for the automated measurement of positions of facilities and the detection of obstacles along the railway for track maintenance. Since the measurement of a large view-area at a high resolution under various disturbances is required, there are problems to be solved in realizing a reliable and stable measurement system that works in the real world. It should be noted that the cost and the ease of use for operators are also crucial issues that are just as important as the technical aspects. We have devised a new method of image processing and an original design of signal processor that meets those demands, and successfully deployed them in practice. In this paper, we report on the developed equipment of detection of obstacles along railway and discuss applying a profile measurement to a large-scale structure.