Three-dimensional Digital Image Correlation Method for Shape and Deformation Measurement of an Object Surface

Two-dimensional digital image correlated with single camera is limited to in-plane deformation measurement of a plane object.Based on three-dimensional binocular vision principle,the advanced three-dimensional digital image correlation(3D-DIC) method breaks through this limit and can measure the three-dimensional shape and deformation of both plane and curved surface under a loading.In this paper,the basic principle and key techniques of 3D-DIC are presented,and two typical validity check experiments were carried out to validate the 3D-DIC.