Error Assessment in Stereo-based Deformation Measurements |
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Authors: | X-D Ke H W Schreier M A Sutton Y Q Wang |
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Institution: | (1) Correlated Solutions Inc, 120 Kaminer Way Parkway Suite A, Columbia, SC 29210, USA;(2) Department of Mechanical Engineering, University of South Carolina, 300 South Main Street, Columbia, SC 29208, USA;; |
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Abstract: | Increasing interest in the use of digital image correlation (DIC) for full-field surface shape and deformation measurements
has led to an on-going need for both the development of theoretical formulae capable of providing quantitative confidence
margins and controlled experiments for validation of the theoretical predictions. In the enclosed work, a series of stereo
vision experiments are performed in a manner that provides sufficient information for direct comparison with theoretical predictions
using formulae developed in Part I. Specifically, experiments are performed to obtain appropriate optimal estimates and the
uncertainty margins for the image locations/displacements, 3-D locations/displacements and strains when using the method of
subset-based digital image correlation for image matching. The uncertainty of locating the 3-D space points using subset-based
pattern matching is estimated by using theoretical formulae developed in Part I and the experimentally defined confidence
margins for image locations. Finally, the uncertainty in strains is predicted using formulae that involves both the variance
and covariance of intermediate variables during the strain calculation process. Results from both theoretical predictions
and the experimental work show the feasibility and accuracy of the predictive formulae for estimating the uncertainty in the
stereo-based deformation measurements. |
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