True stress-strain curve has significant role in the plasticity theory and material engineering and it gives the material properties of the metals and has so many applications in the metal-forming industry. After the onset of necking, the true flow stress- true strain data from a tensile specimen should be modified using the correction methods because of stress triaxiality state. Various correction methods have been proposed for this purpose and can be found in the literature, but only a few methods are applicable. In this study, a new technique for correction of stress-strain curve based on image processing data and introducing some thin walled elements is presented. In this new method, the neck zone is divided into a number of thin walled elements. A numerical technique is used to correct stress on the neck section. The solution of the proposed approach is compared with methods such as Bridgeman and numerical simulation.