Publication:
Super Resolution Digital Image Correlation (SR-DIC): an Alternative to Image Stitching at High Magnifications
Super Resolution Digital Image Correlation (SR-DIC): an Alternative to Image Stitching at High Magnifications
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Date
2021
Authors
R. S. Hansen
D. W. Waldram
T. Q. Thai
R. B. Berke
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Abstract
Background High-resolution Digital Image Correlation (DIC) measurements have previously been produced by stitching
of neighboring images, which often requires short working distances. Separately, the image processing community has
developed super resolution (SR) imaging techniques, which improve resolution by combining multiple overlapping images.
Objective This work investigates the novel pairing of super resolution with digital image correlation, as an alternative method
to produce high-resolution full-field strain measurements.
Methods First, an image reconstruction test is performed, comparing the ability of three previously published SR algorithms
to replicate a high-resolution image. Second, an applied translation is compared against DIC measurement using both lowand
super-resolution images. Third, a ring sample is mechanically deformed and DIC strain measurements from low- and
super-resolution images are compared.
Results SR measurements show improvements compared to low-resolution images, although they do not perfectly replicate
the high-resolution image. SR-DIC demonstrates reduced error and improved confidence in measuring rigid body translation
when compared to low resolution alternatives, and it also shows improvement in spatial resolution for strain measurements
of ring deformation.
Conclusions Super resolution imaging can be effectively paired with Digital Image Correlation, offering improved spatial
resolution, reduced error, and increased measurement confidence
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Keywords
Digital image correlation,
Super resolution,
High magnification,
Strain