Fig. 1. Structure schematic of Lytro light field camera

Fig. 2. Schematic diagram of biplane parameter method

Fig. 3. Blob model in macro and sectional view of particle intensity

Fig. 4. Schematic diagram of tomographic reverse light tracing

Fig. 5. 2D calculation of weighting matrix

Fig. 6. Schematic of calculating particle depth position using similar triangle method

Fig. 7. Lytro camera

Fig. 8. Enlarged and detail images of particle after demosaicing

Fig. 9. Enlarged and detail images of particle after decoding

Fig. 10. Particle images after orthogonal resampling

Fig. 11. Experiment device

Fig. 12. Relative error of particle inversion position using MART algorithm

Fig. 13. Relative error of particle inversion position using improved MART algorithm

Fig. 14. Absolute error of 3D position inversion of random particles