Strain Measurement Based on Speeded-up Robust Feature Algorithm Applied to Microimages from a Smartphone-Based Microscope
Abstract
:1. Introduction
2. Experimental Details
2.1. Principle of FBG
2.2. Setup of the Test
3. Measuring Principle
4. Speeded-Up Robust Feature Method
5. Outlier Rejection
6. Static Image Analysis
7. Analysis of Test Results
8. Conclusions
- (1)
- The accuracy of using SURF to match feature points on the optical fiber before and after the deformation was analyzed. The results indicated that there were some outliers by simply using the SURF method. The outliers were rejected using the MSAC algorithm to improve the accuracy of the proposed method.
- (2)
- The noise obtained by the proposed method under the effect of the external environment were analyzed. The results indicated that the strain increases with increases in the number of images if only the marker on the optical fiber was tracked. This was because the focus shifted when the smartphone continuously shot using automatic focus. In order to solve the problem, the original method was improved. A fixed steel ruler was added to a side of the marker on the optical fiber, and two markers were simultaneously tracked (which is termed as the two-marker tracking method). The effect of mobile focus translation on the measurement results was eliminated using the new method.
- (3)
- The strain data obtained by the FBG measurement and smartphones using the new method were compared and analyzed. The results indicated that the strains obtained from five repeated experiments with different pixels of the smartphone were in good agreement with the FBG data. The results of analyzing the error of the two methods revealed that the maximum error corresponded to 5.2 με and the maximum standard error corresponded to 2.5 με, which satisfied civil engineering requirements.
Author Contributions
Funding
Conflicts of Interest
References
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Test Case | Pixel Value (MP) | Measuring Distance L (cm) | Number of Experiments |
---|---|---|---|
1 | 8 | 30 | 5 |
2 | 10 | 30 | 5 |
3 | 16 | 30 | 5 |
4 | 40 | 30 | 5 |
Pixel Value (MP) | Pixel Value per mm (Pixel) | Measuring Distance L (cm) | με/Pixel |
---|---|---|---|
8 | 505 | 30 | 6.6 |
10 | 588 | 30 | 5.7 |
16 | 705 | 30 | 4.7 |
40 | 1178 | 30 | 2.8 |
Pixel Value (MP) | Experiment No. | Weight (g) | One-Marker Tracking Error (με) | Two-Marker Tracking Error (με) | ||
---|---|---|---|---|---|---|
Variance | Maximum (Absolute) | Variance | Maximum (Absolute) | |||
8 | 1 | 1 | 1.3 | 3.3 | 1.2 | 2.9 |
8 | 2 | 1 | 2.3 | 3.6 | 1.9 | 3.0 |
8 | 3 | 1 | 2.4 | 4.3 | 2.2 | 3.9 |
8 | 4 | 1 | 2.3 | 5.2 | 0.9 | 3.2 |
8 | 5 | 1 | 2.2 | 4.3 | 1.4 | 3.2 |
10 | 1 | 1 | 1.4 | 4.9 | 2.4 | 4.4 |
10 | 2 | 1 | 1.5 | 5.4 | 1.8 | 4.8 |
10 | 3 | 1 | 0.9 | 2.5 | 0.8 | 2.4 |
10 | 4 | 1 | 2.1 | 4.7 | 1.2 | 4.2 |
10 | 5 | 1 | 2.6 | 4.7 | 2.2 | 4.4 |
16 | 1 | 1 | 0.7 | 1.4 | 0.8 | 1.4 |
16 | 2 | 1 | 1.1 | 3.5 | 1.1 | 2.3 |
16 | 3 | 1 | 0.7 | 2.6 | 0.9 | 3.3 |
16 | 4 | 1 | 1.3 | 3.5 | 1.3 | 3.5 |
16 | 5 | 1 | 0.6 | 2.2 | 0.7 | 2.6 |
40 | 1 | 1 | 6.7 | 6.6 | 2.4 | 5.2 |
40 | 2 | 1 | 1.0 | 3.0 | 0.8 | 2.8 |
40 | 3 | 1 | 1.0 | 3.4 | 1.1 | 3.3 |
40 | 4 | 1 | 1.2 | 3.2 | 0.9 | 2.6 |
40 | 5 | 1 | 3.0 | 5.7 | 2.5 | 4.8 |
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Xie, B.; Li, J.; Zhao, X. Strain Measurement Based on Speeded-up Robust Feature Algorithm Applied to Microimages from a Smartphone-Based Microscope. Sensors 2020, 20, 2805. https://doi.org/10.3390/s20102805
Xie B, Li J, Zhao X. Strain Measurement Based on Speeded-up Robust Feature Algorithm Applied to Microimages from a Smartphone-Based Microscope. Sensors. 2020; 20(10):2805. https://doi.org/10.3390/s20102805
Chicago/Turabian StyleXie, Botao, Jinke Li, and Xuefeng Zhao. 2020. "Strain Measurement Based on Speeded-up Robust Feature Algorithm Applied to Microimages from a Smartphone-Based Microscope" Sensors 20, no. 10: 2805. https://doi.org/10.3390/s20102805
APA StyleXie, B., Li, J., & Zhao, X. (2020). Strain Measurement Based on Speeded-up Robust Feature Algorithm Applied to Microimages from a Smartphone-Based Microscope. Sensors, 20(10), 2805. https://doi.org/10.3390/s20102805