Kaiqiang Li, Dan Zhu, Xinxin Tong. Digital Speckle Correlation Method Based on Improved Curved Surface Fitting Method[J]. Laser & Optoelectronics Progress, 2018, 55(5): 051001
- Laser & Optoelectronics Progress
- Vol. 55, Issue 5, 051001 (2018)
Fig. 1. Schematic of the principle of digital speckle correlation method
Fig. 2. Schematic of the principle of sub-pixel localization algorithm based on curved surface fitting method
Fig. 3. Speckle pattern A
Fig. 4. Curves of calculation results of sub-pixel displacement in four directions with six schemes. (a) 0°; (b) 90°; (c) 45°; (d) 135°
Fig. 5. Mean error curves of calculation results of sub-pixel displacement in both directions with six schemes. (a) 0°; (b) 90°
Fig. 6. Mean relative error curves of calculation results of sub-pixel displacement in both directions with six schemes. (a) 0°; (b) 90°
Fig. 7. Mean error curves of calculation results of sub-pixel displacement in two directions and curves of calculation results of sub-pixel displacement in the other two directions for all four cases of scheme six. (a) 0°; (b) 90°; (c) 45°; (d) 135°
Fig. 8. Mean error curves of the uniaxial tension. (a) Six schemes; (b) all four cases of scheme 6
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