Fig. 1. Basic representation of 4D light field^[23]. (a) Parametric representation of two-parallel plane; (b) sub-aperture image array

Fig. 2. EPI representation of 4D light field. (a) EPI of two-parallel plane light field^[14]; (b) EPI of circular light field

Fig. 3. Focal stack representation of 4D light field

Fig. 4. Comparison between light field imaging and traditional imaging in different situations^[56]. (a) Occlusion; (b) defocus

Fig. 5. Superpixel representation of 4D light field and its local magnification^[84]. (a) Image 1; (b) image 2

Fig. 6. Representation of 4D light field graph^[88]. (a) Expression of light field pattern; (b) real data

Fig. 7. Hypergraph representation of 4D light field^[91]. (a) Relationship between light field superpixel and light set; (b) light field hypergraph represcntation

Fig. 8. Multiplane image representation of light field^[98]

Fig. 9. Schematic of 2D MPI and its frequency domain representation^[98]. (a) MPI in space domain; (b) MPI infrequency domain

Fig. 10. Fourier slice theorem^[105]. (a) Traditional 2D Fourier slice theorem; (b) generalized Fourier slice theorem

Fig. 11. Fourier slice photography theorem^[105]

Fig. 12. Fourier parallax layer representation^[113]. (a) FDL representation schematic; (b) FDL representation in real data

Fig. 13. Two construction methods of polar focus spectrum EFS^[117]