An automatic digital image processing technique is presented for whole-surface measurement of specimens' deformations during triaxial tests. This method incorporates digital imaging techniques and computer-aided analysis to assess the deformation throughout a triaxial test. A detailed description of hardware as well as other equipment is provided. Regulated power supply along with a darkened chamber is adopted to ensure the stability of the lighting environment. Data analysis methodology including distortion correction, pixel equivalent normalization, strain field calculation and data splicing...
