Fig. 1. Light field schematic. (a) Diagram of light field biplane parameterization; (b) refocusing schematic

Fig. 2. Schematics of light transmission sampling of two plenoptic cameras. (a) Unfocused plenoptic camera;(b) focused plenoptic camera

Fig. 3. Refocusing images. (a) Focus on far; (b) focus on near

Fig. 4. Simplified diagram of light transmission of focused plenoptic camera

Fig. 5. Raw light field image and all-in-focus image. (a) Partial enlarged raw light field image; (b) all-in-focus image

Fig. 6. Diagram of experiment device for calibration

Fig. 7. Curve of refocusing coefficient-sharpness

Fig. 8. Results of depth calibration. (a) 7 points; (b) 9 points

Fig. 9. Reprojection error. (a) Corners error; (b) average reprojection error

Fig. 10. Flow chart of particle tracking

Fig. 11. Simplified flow chart of light field PTV technology

Fig. 12. Schematic of experimental system. (a) Experimental device; (b) measuring area

Fig. 13. Tracking results of two adjacent frame particles. (a) Velocity slices in z direction; (b) velocity slices in y direction; (c) angular velocity