Fig. 1. Parametric representation of light field camera in two planes

Fig. 2. Light field imaging structure

Fig. 3. Principle of image depth extraction

Fig. 4. Structural diagram of the algorithm

Fig. 5. Original image and local enlarged images. (a) Original image; (b) local enlarged image; (c) local two-time enlarged image

Fig. 6. Super-resolution recovery results. (a) Original image; (b) local enlarged image 1; (c) local enlarged image 2; (d) local two-time enlarged image 3

Fig. 7. Re-focusing image sequence. (a) Original image; (b) refocus image sequence (36 pieces)

Fig. 8. Schematic of the patch

Fig. 9. Standard value measurement of the patch. (a) Distance is 5 cm; (b) distance is 10 cm; (c) distance is 20 cm

Fig. 10. Standard value measurement of the patch. (a) Literature data; (b) data in this paper

Fig. 11. Algorithm validation. (a) Results of algorithm in literature; (b) results of proposed algorithm

Fig. 12. Six groups of target images to be measured. The distance of target 1 is fixed as 20 cm, and the distance of target 2 is (a) 25 cm; (b) 30 cm; (c) 40 cm; (d) 50 cm; (e) 60 cm; (f) 70 cm

Fig. 13. Four groups of target images to be measured. (a) 3 targets; (b) 7 targets; (c) 10 targets; (d) 12 targets