Fig. 1. PIV system schematic diagram

Fig. 2. Basic block diagram of optical flow pyramid interpolation optimization for particle image velocimetry

Fig. 3. Single-vortex velocity field reconstruction

Fig. 4. Pair vortex velocity field reconstruction

Fig. 5. DNS turbulence velocity field reconstruction

Fig. 6. Influence of displacement on accuracy

Fig. 7. Influence of particle size on reconstruction error

Fig. 8. PIV measurement experimental platform

Fig. 9. Particle images collected by rotation experiment

Fig. 10. The estimated velocity field of rotation experiment

Fig. 11. Distribution of reconstruction angle error for any pixel point of the rotation experiment

Fig. 12. Particle image captured by water injection experiment

Fig. 13. The estimated velocity field of water injection experiment

Fig. 14. Distribution of reconstruction angle errors for any pixel point of the water injection experiment