Shuhang Li, Xu Gao, Zhaowu Liu, Wenhao Hu. Algorithm for Sub-Pixel Detection of Fringe Image Displacement Based on Gray-Level Interpolation[J]. Acta Optica Sinica, 2021, 41(10): 1012002
- Acta Optica Sinica
- Vol. 41, Issue 10, 1012002 (2021)
Fig. 1. Principle diagram of displacement measurement system
Fig. 2. Simulated image of virtual moire fringe
Fig. 3. Flow chart of grayscale extreme value algorithm
Fig. 4. Simulation experiment. (a) Interference fringe; (b) gray three-dimensional model; (c) gray interpolation fitting curve; (d) bright fringe sub-pixel center line
Fig. 5. 28 fringe images with phase step of π/50
Fig. 6. Grayscale image and relative error versus phase under different algorithms. (a) Three-dimensional grayscale image; (b) grayscale extreme value method; (c) image correlation method; (d) L-K optical flow method
Fig. 7. Relative calculation time
Fig. 8. Experimental device for interference displacement measurement
Fig. 9. Experimental data graphs. (a) Step-displacement graph; (b) scatter plot of measured values; (c) residual diagram; (d) relative error-displacement needle plot
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