DBPapers
DOI: 10.5593/SGEM2016/B22/S10.099

A PROPOSAL FOR ONE-IMAGE PHOTOGRAMMETRY SYSTEM FOR MEASURING THE CLEARANCE DISTANCE. CASE STUDY.

A. Barbasiewicz, K. Bobkowska, P. Bujala, A. Janowski, M. Przyborski
Thursday 8 September 2016 by Libadmin2016

References : 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-59-9 / ISSN 1314-2704, June 28 - July 6, 2016, Book2 Vol. 2, 775-782 pp

ABSTRACT
Measurement of the clearance distance (both in the context of the rail and road) is one
of the current and increasingly discussed topics in the context of photogrammetric and
image processing (computer vision) methods . The article presents a description of a
simple and rapid method of measure the clearance distance between the obstacles by
using one-image photogrammetry. The proposed method was tested for the railway,
tram and road clearance measurements. This method is based on placing (dynamic or
static) testing board in the clearance distance between the relevant obstacles. In
addition, this method involves the use of non-metric camera to take images with the
appropriate distance, which is dependent on the clearance distance. Before taking a
picture, the camera should be calibrated and appropriate parameters should be set. Then the pictures are processed using the appropriate software. Finally we have a fully metric image, which can be used for doing measurements. Achieved accuracy oscillated within 1-2 pixels. One of the advantages of this system is the speed of measurements collected at the field session. This method is much more economically and financially efficient than currently known systems for doing such a measurements, which are based on metric cameras or surveying instruments.

Keywords: clearance distance, image processing, one image photogrammetry, image
processing