Tensile sample deformation measurement method based on digital image correlation

The invention provides a tensile sample deformation measurement method based on digital image correlation. The tensile sample deformation measurement method mainly applies an image correlation method and combines a measurement method based on a standard surface to realize high-speed and high-precision measurement of a test sample. The tensile sample deformation measurement method comprises the following steps: 1, carrying out integer pixel positioning based on the image correlation; 2, carrying out sub pixel positioning based on two-dimension curved surface fitting; and 3, carrying out image mapping positioning based on the standard surface. The three steps are organically combined to form a main body of the whole method. The tensile sample deformation measurement method has the beneficial effects that a standard plane mapping method is combined by adopting a simplified digital image correlation method so that the test sample is prevented from being marked; an operation flow is simplified, the measurement speed and the precision of the deformation of the test sample are improved, and the practicability of the system is improved.