AUTOMATED LOW-COST PHOTOGRAMMETRY FOR FLEXIBLE STRUCTURE MONITORING
Wang, C. H.
Mills, J. P.
Miller, P. E.
Structural monitoring requires instruments which can provide high precision and accuracy, reliable measurements at good temporal
resolution and rapid processing speeds. Long-term campaigns and flexible structures are regarded as two of the most challenging
subjects in monitoring engineering structures. Long-term monitoring in civil engineering is generally considered to be labourintensive
and financially expensive and it can take significant effort to arrange the necessary human resources, transportation and
equipment maintenance. When dealing with flexible structure monitoring, it is of paramount importance that any monitoring
equipment used is able to carry out rapid sampling. Low cost, automated, photogrammetric techniques therefore have the potential to
become routinely viable for monitoring non-rigid structures.<br><br>
This research aims to provide a photogrammetric solution for long-term flexible structural monitoring purposes. The automated
approach was achieved using low-cost imaging devices (mobile phones) to replace traditional image acquisition stations and
substantially reduce the equipment costs. A self-programmed software package was developed to deal with the hardware-software
integration and system operation. In order to evaluate the performance of this low-cost monitoring system, a shaking table
experiment was undertaken. Different network configurations and target sizes were used to determine the best configuration. A large
quantity of image data was captured by four DSLR cameras and four mobile phone cameras respectively. These image data were
processed using photogrammetric techniques to calculate the final results for the system evaluation.