Detecting the Correlated Region by Sub pixel Registration Approach of Newton Raphson Method

Abstract

This paper intends to describe the process of Digital Image Correlation (DIC) and to find the pixel correlation among the images accurately when they are moved and deformed. It is a popular and effective tool for the measuring surface displacements and displacement gradients in materials in the field of mechanics and strain measurements under deformation. Although the underlying principle of DIC is rather simple, the two main challenges, the sub-pixel registration accuracy and the computation efficiency, are always present in the practical implementations. This paper is presented the development and the limited experimental verification of sub-pixel registration algorithm using the Newton-Raphson method.