@article{Erica Elice Saloma Uy_Tirawat Boonyatee_2017, title={IMAGE PROCESSING FOR GEOTECHNICAL LABORATORY MEASUREMENTS}, volume={10}, url={https://geomatejournal.com/geomate/article/view/1970}, abstractNote={<p>This research is an effort to apply image processing techniques for non-contact determination of<br>2D and 3D displacements of specimens in a triaxial apparatus. For the 2D measurement, a calibration<br>procedure is applied to correct image distortions before the positions of interested points are tracked by the<br>pyramidal optical flow algorithm (Lucas and Kanade, 1981). By considering the change of position, the<br>displacement of an interested point can be determined. The results are compared with the measurements<br>obtained from LVDTs and are well agreed. For 3D measurement, calibration, rectification, correspondence and<br>3D re-projection are performed. It is verified by an isotropic compression test of a cylindrical sponge in a<br>triaxial apparatus. The estimated displacement and discharge of water are compared with the measured ones<br>and are well agreed. The repeatability and resolution of the developed system are found to be in the order of<br>0.006 cm and 0.004 cm, respectively.<br><br></p>}, number={22}, journal={GEOMATE Journal}, author={Erica Elice Saloma Uy and Tirawat Boonyatee}, year={2017}, month={Feb.}, pages={1964–1970} }