Fig. 1. Binocular stereo imaging model

Fig. 2. Flow chart of improved ERA

Fig. 3. Experiment configuration. (a) Binocular camera measuring instrument; (b) experimental constraint state; (c) identification of No.9 coded marker; (d) wind turbine blade

Fig. 4. Camera calibration result

Fig. 5. Vibration displacement curves of coded marker. (a) X direction; (b) Y direction; (c) Z direction

Fig. 6. Stabilization diagrams for traditional ERA. (a) X direction; (b) Y direction; (c) Z direction

Fig. 7. Stabilization diagrams after noise removal by SVD. (a) X direction; (b) Y direction; (c) Z direction

Fig. 8. Diagrams of damping and frequency. (a) X direction; (b) Y direction; (c) Z direction

Fig. 9. Stabilization diagrams for improved ERA. (a) X direction; (b) Y direction; (c) Z direction

Fig. 10. Normalized singular values. (a) X direction; (b) Y direction; (c) Z direction

Fig. 11. Stabilization diagram for B&K instrument