Fig. 1. Recording principle of point hologram

Fig. 2. Level set segmentation results. (a) Measured square object image after segmentation; (b) binary image of Fig. 2(a); (c) simulated rectangular object image after segmentation; (d) binary image of Fig. 2(c)

Fig. 3. Flow chart of algorithm

Fig. 4. Schematic of experimental system

Fig. 5. (a) Hologram; (b) intensity map of reconstructed image; (c) phase map with distortion; (d) phase value in the 200th row of phase map with distortion

Fig. 6. (a) Effect diagram of level set segmentation; (b) phase mask map; (c) phase distortion map without detected object; (d) fitted phase distortion map

Fig. 7. (a) Correction effect by proposed algorithm; (b) correction effect by algorithm 1; (c) distortion region selected by hand in algorithm 2; (d) correction effect by algorithm 2; (e) phase height in the 200th row after correction by three algorithms