DIC/Moire hybrid method based on regular patterns for deformation measurement

Digital Image Correlation (DIC) is a superior optical method to measure the surface deformation with a high accuracy. Currently, most researches on DIC are based on random patterns. In this paper, A DIC/Moire hybrid method using regular patterns is proposed for deformation measurement. In this method, a Moire fringe technique based on correlation coefficient is developed to provide accurate initial deformation estimation for DIC. Experimental results indicate a higher computational efficiency by the proposed method than the conventional DIC method. It is also found that the calculation accuracy increases using regular patterns. The advantage of obtaining accurate initial estimation by the DIC/Moire hybrid method may enable potential application in deformation measurements. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement