Fig. 1. Schematic diagram of point-based method^[7-8]

Fig. 2. Schematic diagram of WRP method^[15]

Fig. 3. Schematic diagram of polygon-based method^[20]

Fig. 4. Comparison of computation time among traditional polygon-based method, full analytical polygon-based method, traditional 3D affine transformation polygon-based method, and full analytical 3D affine transformation polygon-based method^[27]

Fig. 5. Schematic diagram of layer-based method

Fig. 6. Hybrid architecture based on CPU and GPU^[32]

Fig. 7. Comparison of calculation time among different methods^[35]

Fig. 8. Schematic diagram of GS algorithm^[38]

Fig. 9. Double-phase encoding method. (a) Macro pixel encoding method^[45]; (b) single pixel encoding method^[46]

Fig. 10. Hologram generation algorithm based on supervised learning. (a) Schematic diagram; (b) target image; (c) holograms; (d) reconstructed images^[50]

Fig. 11. Hologram generation algorithm based on unsupervised learning. (a) Architecture of the holo encoder; (b) reconstructed intensity distribution; (c) hologram; (d) reconstructed phase distribution^[56]

Fig. 12. Mark-V holographic display system. (a) System architecture; (b) display effect^[62]

Fig. 13. Active Tiling holographic display system. (a) System architecture; (b) display effect^[63-64]

Fig. 14. Large size holographic display system. (a) System architecture; (b) display effect^[67-68]

Fig. 15. Ultra-thin holographic display system. (a) System architecture; (b) display effect^[69]

Fig. 16. Color holographic display system based on "Holobricks". (a) System architecture; (b) display effect^[70]