On the Performance of the Subpixel Displacement Estimations Used in Digital Speckle Correlation Method (DSCM)

Several subpixel displacement estimation methods, including interpolation, fitting of distribution of the correlation coefficients, and two types of gradientbased methods, are introduced in this paper. These methods are compared in detail, and evaluated according to relative errors of calculating results. Based on the comparison, a selection criterion for the future application of DSCM is given.