Photogrammetric assessment of a steel girder surface deformations with a multi-image acquisition method

摘要

Non-metric consumer cameras have become more and more advanced in the recent years.udTheir capability to measure deformations has been investigated and described in the diplomaudthesis. Two preliminary experiments were conducted before the final deformationudmeasurements. In the first preliminary experiment a test of efficiency of the image matchingudmethod and geometric accuracy of image measurements was conducted. Based on this test,udsecond preliminary test was conducted in order to test configuration of three non-metricudcameras, and their suitability to measure photogrammetrically 3D deformations. A multiudimage measurements of deformations of a steel girder were conducted. Based on the outcomeudof these tests, close range photogrammetry was used to measure deformations ofudlongitudinally stiffened plated girders in a bending-shear interaction experiment. In this finaludexperiment three non-metric cameras Canon EOS 5 Mk II were used to documentuddeformations. Positions of targeted points in each steel girder, from which deformations wereudcalculated, were computed with the direct linear transformation.