Chenglin Zheng, Dingding He, Qingguo Fei. Improved Digital Image Correlation Method Based on Gray Gradient Denoised by Regularization Method[J]. Acta Optica Sinica, 2018, 38(8): 0812002
- Acta Optica Sinica
- Vol. 38, Issue 8, 0812002 (2018)
Fig. 1. Numerical simulation of speckle image
Fig. 2. Absolute relative error of gray gradient in image sub-region after adding noise
Fig. 3. Calculation errors of three algorithms with different sub-pixel displacements. (a) Mean error; (b) standard deviation error
Fig. 4. Calculation errors of three algorithms with different noise levels. (a) Absolute value of mean error; (b) standard deviation error
Fig. 5. Anti-noise ability test system with digital image correlation method
Fig. 6. Absolute error of three algorithms with theoretical shift of 0 pixel. (a) Finite difference; (b) spline interpolation; (c) Tikhonov regularization
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Table 1. Calculation errors and computation time of three algorithms with theoretical displacement of 0.3 pixel
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Table 2. Calculation errors of three algorithms with theoretical displacement of 0 pixel
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