Abstract
The algorithms for Digital image correlation (DIC) in subpixel determination have been well developed regarding the accuracy and efficiency. In this paper, an efficient integer-pixel search scheme with combination of an improved particle swarm optimization (PSO) algorithm and the block-based gradient descent search (BBGDS) algorithm has been proposed. Incorporated with the inverse compositional Gauss-Newton (IC-GN) algorithm for subpixel registration and the parallel computing technology, a real-time DIC algorithm for displacement or strain measurement for dynamic tests has been achieved. Numerical simulation and the experimental results showed that the proposed method could reach a rate of 60 fps (frames per second) for strain measurement under cyclic loading with equivalent accuracy compared with the conventional DIC algorithm.
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