Perspective Compensation of 2D-DIC Measurements by Combination with Speckle Imaging

Two-dimensional Digital Image Correlation (2D-DIC) is a popular method for determining object in-plane motion and deformation by tracing surface texture. However, the applicability of the method is limited by perspective errors that may be generated by object surface curvature, out-of-plane motions and non-perpendicular camera alignment. The resulting variations in camera magnification lead to errors in the measured surface motion signals.