Digital image correlation through image registration in the frequency domain

• Type: Article in International Scientific Journal
• Date: 2018

Authors

Barros, F (Author) Other; Sousa, PJ (Author) FEUP; Tavares, PJ (Author) Other; Moreira, PMGP (Author) Other

Journal

Title: Journal of Strain Analysis for Engineering Design

Vol. 53

Pages: 575-583

ISSN: 0309-3247

Publisher: SAGE

Indexing

ISI Web of Knowledge - 8 Citations

Scopus - 11 Citations

Other information

Authenticus ID: P-00P-Y9M

DOI: 10.1177/0309324718802705

Abstract (EN): The present work analyses displacement field computations for several digital image correlation test cases obtained through the application of image registration in the Fourier domain. The applied method relies on the properties of the discrete Fourier transform with regard to the cross-correlation function to find the rigid displacement between two subsets. The computed displacement fields were compared to their analogous values obtained through a commercial digital image correlation code. The test cases cover both two-dimensional and three-dimensional digital image correlation and make use of the ability of the developed method to calculate the translation and rotation between subsets from images at different loading states, as well as its capacity to match subsets from two cameras of a stereo rig. The presented analysis aims to contribute to the investigation of the use of correlation in the frequency domain as the basis for an alternative to conventional digital image correlation which could provide advantages in terms of robustness and efficiency, particularly in field measurements, where the lack of control over lighting and other factors impacting image quality requires a system which is optimised towards low dependence on the optimal quality of these conditions.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9