Application of a Combinatorial DIC Algorithm in Sub-Pixel Displacement Measurement

Pengxiang Ge; Guihua Li

doi:10.3788/LOP55.111202

Laser & Optoelectronics Progress, Volume. 55, Issue 11, 111202(2018)

Application of a Combinatorial DIC Algorithm in Sub-Pixel Displacement Measurement

Pengxiang Ge and Guihua Li^*

Author Affiliations

College of Electrical Engineering and Automation, Anhui University, Hefei, Anhui 230601, China

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Figures & Tables(7)

Fig. 1. Basic principle of DIC. (a) Image before deformation; (b) image after deformation

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Fig. 2. Diagram of quadric surface fitting

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Fig. 3. Simulated speckle pattern before and after translation. (a) Before translation; (b) after translation

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Fig. 4. Relative error of sub-pixel displacement

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Fig. 5. Relative error of integer pixel displacement

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Table 1. Search time of several algorithmss
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Table 1. Search time of several algorithmss
Fittingmethod Interpolationmethod AGA-fittingmethod AGA-interpolationmethod CombinatorialDIC method
1.6 1.9 0.43 0.51 0.58

Table 2. Measurement results of combinatorial DIC algorithm

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Table 2. Measurement results of combinatorial DIC algorithm

Actual displacement /pixel	Measured displacement /pixel	Absolute error /pixel	Relative error /%
0.1	0.1016	0.0016	1.600
0.3	0.3039	0.0039	1.300
0.5	0.4971	0.0029	0.5800
0.7	0.6990	0.0010	0.1400
0.9	0.8970	0.0030	0.3300
2	1.9967	0.0033	0.1650
4	3.9985	0.0015	0.0375
6	6.0044	0.0044	0.0730
8	7.9998	0.0002	0.0025
10	10.0051	0.0051	0.0510

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Pengxiang Ge, Guihua Li. Application of a Combinatorial DIC Algorithm in Sub-Pixel Displacement Measurement[J]. Laser & Optoelectronics Progress, 2018, 55(11): 111202

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