Systematic errors in digital image correlation due to undermatched subset shape functions

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A novel coarse-fine search scheme for digital image correlation method (2006, methodology): “The technique is suitable and sufficiently accurate in comparison with the previous methods [28].”
Improved image-based deformation measurement for geotechnical applications (2016, methodology): “Each reference subset is allowed to deform using a shape (or warp) function describing first-order deformations in conjunction with image-intensity interpolation techniques to improve the correlation between reference and target subsets via optimization (Schreier and Sutton 2002).”
Effects of Various Shape Functions and Subset Size in Local Deformation Measurements Using DIC (2015, background): “1) Higher order shape functions have a larger critical template size and lead to better results when the template is large enough; 2) The maximum strain within the band is proportional to both displacement and strain errors and does not affect the band width; 3) Second-order shape functions can obta”
Theoretical Analysis on the Measurement Errors of Local 2D DIC: Part I Temporal and Spatial Uncertainty Quantification of Displacement Measurements (2016, background): “From the limited theoretical works about the error assessment of DIC, some important achievements can be found in References [21, 29, 31, 38, 44, 45].”
The use of full-field measurement methods in composite material characterization: interest and limitations (2004, background): “[51] Schreier HW, Sutton MA.”