Fig. 1. Basic working principle of FBG

Fig. 2. Model meshing and simulated plantar pressure distribution cloud map

Fig. 3. K fold cross verification

Fig. 4. Specific flow of KCV-SVR

Fig. 5. Location and spectral diagram of FBG sensor

Fig. 6. Relationship between FBG sensors and pressure

Fig. 7. Different postures of participants

Fig. 8. The center wavelength deviation of FBG in standing and one-legged standing posture

Fig. 9. Parameter selection of KCV method（K=5）

Fig. 10. Prediction results of SVR and KCV-SVR chart

Fig. 11. SVR and KCV-SVR prediction errors