Digital image processing technique for measurement of the local deformation of soil specimen in triaxial test

Radial and axial deformations are measured by digital image processing method(DIPM) and not only the average deformation of whole specimen but also the local deformation at different location of soil specimen can be obtained. The theoretical and real accuracy are given in this paper. At the end, local deformations measured at different section by DIPM and the average results by traditional method are compared.