Modified Surface Fitting Algorithm using Digital Image Correlation for Effective Displacement Analysis S.Agnes Shifani1, M.S. Godwin Premi2 1Research Scholar, Department of ECE, Sathyabama Institute of Science and Technology, Chennai 1Professor, School of EEE, Sathyabama Institute of Science and Technology, Chennai shifaniece2110@gmail.com, msgodwinpremi@gmail.com Abstract Displacement analysis utilizing surface fitting algorithm (SFA) is an essential technique in digital image correlation additionally with robust in computational complexity without noise interference in real time applications. There is a need in expanding and improving the accuracy of existing surface fitting algorithm (E-SFA). In order to achieve this modified surface fitting algorithm (M-SFA) is proposed. Integrated interpolation technique utilized to search the pixel position and its corresponding gray level value in the