Fig. 1. Coefficient field of image in different oblique degrees

Fig. 2. Image correlation process with the discretization matching method

Fig. 3. Schematic diagram of the discretization matching method

Fig. 4. Discretization subset matching principle

Fig. 5. DIC matching of small subsets within the oblique images

Fig. 6. Elimination of mismatched points

Fig. 7. Schematic diagram of oblique imaging projection

Fig. 8. Simulated speckle images in different oblique angles

Fig. 9. Matching probability statistics of oblique images under different subset sizes

Fig. 10. Displacement u field and correlation residual of different oblique angles

Fig. 11. Accuracy test results of discretization matching method

Fig. 12. Matching examples of different matching methods

Fig. 13. Performance comparison of different matching methods

Fig. 14. Acquire UAV blade images under oblique field of view

Fig. 15. Discretization matching of oblique speckle images of the UAV blade

Fig. 16. Dynamic deformation fields of the UAV blade