METHOD FOR MEASURING DEVIATION OF TRACK AND SYSTEM FOR MEASURING DEVIATION OF TRACK USED FOR THE SAME

PROBLEM TO BE SOLVED: To automatically measure the deviation of a track, reducing load to the track and at a lower installation cost as well, to confirm images of the actual place from a remote place when an abnormal value is generated and so on, and to ensure a higher measurement precision. SOLUTION: Two or more markers 1 are attached beforehand at predetermined intervals to a track R in a section being a deviation-of-track measuring object along the extending direction of the track, and images of all the markers are picked up at predetermined time intervals with a digital camera 3 set with its optical axis directed in an oblique direction to the extending direction of the track in the section of the measuring object so that all the markers may be picked up in an image. First, correspondences between the positions of the markers on the picked up images, and separately-measured positions in a predetermined measurement coordinate system of those markers are found by an on-site personal computer 9. Then, the positions of those markers in the predetermined measurement coordinate system are found respectively, using the correspondences from the positions of the markers on the images picked up at the predetermined time intervals, and variations of the track are found from the quantities of relative positional differences of the found positions of the markers in the predetermined measurement coordinate system. COPYRIGHT: (C)2004,JPO