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High‐speed, two‐dimensional digital image correlation algorithm using heterogeneous (CPU‐GPU) framework
Author(s) -
Thiagu Mullai,
Subramanian Sankara J.,
Nasre Rupesh
Publication year - 2020
Publication title -
strain
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.477
H-Index - 47
eISSN - 1475-1305
pISSN - 0039-2103
DOI - 10.1111/str.12342
Subject(s) - computer science , parallel computing , digital image correlation , central processing unit , computational science , graphics processing unit , general purpose computing on graphics processing units , computation , algorithm , cuda , speedup , graphics , computer graphics (images) , computer hardware , physics , optics
Abstract Two‐dimensional digital image correlation (2D‐DIC) is an experimental technique used to measure in‐plane displacement of a test specimen. Real‐time measurement of full‐field displacement data is challenging due to enormous computational load of the algorithm. In order to improve the computational speed, the focus of recent research works has been on the approach of parallelization across subsets within image pairs using graphics processing unit (GPU). But alternate GPU‐based parallelization approaches to improve the performance of this algorithm as per the order of data processing have not been explored. To address this research gap, our method utilizes parallelism within a subset as well as across subsets for each computation step in an iteration cycle. A heterogeneous (CPU‐GPU) framework in combination with a pyramid‐based initial values estimation for subsets (in parallel) is proposed in this work. The precompute steps of the proposed framework are implemented using CPU, whereas the main iterative steps are realized using GPU. It is demonstrated that the overall computational speed of the proposed heterogeneous framework improves by ≈ 9 × compared to a sequential CPU‐based implementation for a pair of gray‐scale images with a resolution of 588 × 2 , 048 pixels. As an important milestone, feasibility to measure deformations in real time ( ≤ 1 s) is manifested in this study.