Comparison of local and global approaches to digital image correlation

Abstract : Local and global approaches to digital image correlation are compared when the displacement interpolation is based upon bilinear shape functions (i.e., with four-node quadrilaterals). The resolution in terms of displacements and strains associated with both techniques are evaluated a priori and validated a posteriori by using series of images of real experiments. It is shown that global approaches generally out-perform a local approach.
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François Hild, Stéphane Roux. Comparison of local and global approaches to digital image correlation. Experimental Mechanics, Society for Experimental Mechanics, 2012, 52 (9), pp.1503-1519. ⟨10.1007/s11340-012-9603-7⟩. ⟨hal-00750756⟩

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