The effect of out-of-plane motion on 2D and 3D digital image correlation measurements

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Effects of Various Shape Functions and Subset Size in Local Deformation Measurements Using DIC (2015, methodology): “The three-dimensional (3D)-DIC method was used to avoid errors caused by out-of-plane displacements [23, 24].”
Error Assessment in Stereo-based Deformation Measurements (2011, background): “These lenses have been used extensively for 2D computer vision, where large stand-off distances (necessary with such lenses) tend to reduce the deleterious effects of unwanted out-of-plane motion [14].”
Theoretical Analysis on the Measurement Errors of Local 2D DIC: Part I Temporal and Spatial Uncertainty Quantification of Displacement Measurements (2016, background): “On the experimental side, efforts have been paid to quantify the effects of lens distortion [9, 13–18], misalignment of cameras [19, 20], camera noise [21–23], and speckle patterns [24–28].”
High-Speed Photography and Digital Optical Measurement Techniques for Geomaterials: Fundamentals and Applications (2017, background): “In geometries, such as UC where out of plane displacement is a particular problem, it is expected that 3D data would be more reliable than 2D data (Sutton et al. 2008).”
Precise determination of the Poisson ratio in soft materials with 2D digital image correlation (2013, background): “[29] M.”