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arXiv:2605.19547 · detector doi_compliance · incontrovertible · 2026-05-20 02:37:40.112971+00:00

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Dong, Y. L., & Pan, B. (2017). A review of speckle pattern fabrication and assessment for digital image correlation. Experimental Mechanics, 57(8), 1161–1181. https://doi.org/10.1007/s11340-017-0283- 22 Appendix A — DIC Uncertainty Quantification This appendix provides the detailed procedures and analyses performed to quantify the uncertainty associated with the 3D-DIC measurements used for stretch computation and constitutive parameter identification. Only the main conclusions are presented in the Methods section; the full methodology is documented here for completeness. A.1 Speckle Pattern Quality Assessment For each specimen, the undeformed speckle image was evaluated using a 2D Fourier transform to examine the spatial-frequency content of the stochastic pattern. Following the recommendations of Dong and Pan (2017) [55] , radial spectra were extracted and inspected for: • absence of periodic low-frequency components, • isotropy of the frequency distribution, • sufficient high-frequency content to ensure sub-pixel correlation accuracy. All specimens exhibited broad and isotropic spectra, consistent with high-quality speckle patterns suitable for DIC on hydrated soft tissues. No sample required exclusion or repainting. A.2 Illumination and Imaging Stability Because hydrated biological tissues are prone to specular reflections and contrast drift, illumination conditions were controlled throughout the test campaign: • backlighting intensity was kept constant, • camera exposure

Evidence payload

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