A Photogrammetric System Design to Determine the Load-Deflection Behaviors of Materials in Civil Engineering

This paper defines a photogrammetric system developed to automatically measure displacements at a large number of points on structural elements in static or quasi-static load experiments. The system consists of hardware and software. Basically, the hardware component includes online image acquisition system with three charge coupled device (CCD) cameras and the software comprises the photogrammetric processing of the obtained image data. The computational approach of the system involves initially determining the camera calibration parameters, then calculating three-dimensional (3D) object coordinates of signalized points on the test object during the load test. The measurements are performed in near real-time (