MEASUREMENT AND TRACKING OF CIRCLE CENTERS FOR GEOTECHNIC APPLICATIONS

This paper presents a digital monoscopic system designed to determine the deformations of a test field to investigate mechanic phenomena in reinforced earth. The geotechnic problem is briefly presented and the following photogrammetric problem is described in detail. The solution strategy and its implementation are pointed out, with particular emph asis on the parameters that are critical for the results. The system d etermines automatically the image co-ordinates of the centres of circl es of known dimensions that substitute soil particles in a physical mo del. Position determination is based on the analysis of mean and stand ard deviation of the grey level of a digital image representing a sect ion of the soil. After a brief description of the system implementatio n, tests on different real applications are presented. (C) 1998 Elsevi er Science B.V. All rights reserved.