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Gradient Correlation Functions in Digital Image Correlation
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-4879-8261
2019 (English)In: Applied Sciences, E-ISSN 2076-3417, Vol. 9, no 10, article id 2127Article in journal (Refereed) Published
Abstract [en]

The performance of seven different correlation functions applied in Digital Image Correlation has been investigated using simulated and experimentally acquired laser speckle patterns. The correlation functions were constructed as combinations of the pure intensity correlation function, the gradient correlation function and the Hessian correlation function, respectively. It was found that the correlation function that was constructed as the product of all three pure correlation functions performed best for the small speckle sizes and large correlation values, respectively. The difference between the different functions disappeared as the speckle size increased and the correlation value dropped. On average, the random error of the combined correlation function was half that of the traditional intensity correlation function within the optimum region.

Place, publisher, year, edition, pages
MDPI, 2019. Vol. 9, no 10, article id 2127
Keywords [en]
image correlation, gradient correlation functions, laser speckles
National Category
Applied Mechanics
Research subject
Experimental Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-75069DOI: 10.3390/app9102127ISI: 000473748100162Scopus ID: 2-s2.0-85066461522OAI: oai:DiVA.org:ltu-75069DiVA, id: diva2:1331738
Note

Validerad;2019;Nivå 2;2019-06-27 (johcin)

Available from: 2019-06-27 Created: 2019-06-27 Last updated: 2019-08-16Bibliographically approved

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Sjödahl, Mikael

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