Tiantian Zhu, Zhongnan Fu, Mei Zhang, Pei Ye, Guihua Li. Initial Value Estimation of Digital Image Correlation Method in Deformation Measurement Based on Feature Matching[J]. Laser & Optoelectronics Progress, 2020, 57(18): 181012
- Laser & Optoelectronics Progress
- Vol. 57, Issue 18, 181012 (2020)
Fig. 1. Schematic diagram of subsets before and after deformation
Fig. 2. Flow chart of DIC based on feature matching
Fig. 3. Blurring effects of Gaussian blurring and nonlinear blurring at different evolutionary times at different evolutionary time. (a) ti=5.12 s; (b) ti=20.48 s; (c) ti=81.92 s; (d) ti=130.04 s; (e) ti=206.42 s
Fig. 4. Main directions of feature points
Fig. 5. Matching principle of IC-GN algorithm
Fig. 6. Simulated speckle patterns. (a) Reference image and ROI; (b) target image
Fig. 7. Experimental results. (a) Sampling data points at grid center; (b) feature points of reference image; (c) feature points of target image
Fig. 8. Feature matching points
Fig. 9. Calculation results under different displacements. (a) Computation time; (b) comparison of displacement
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Table 1. Calculation results of data points
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Table 2. Comparison of measured displacement and error
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