Fig. 1. Simulation light path diagram of in-line digital holography

Fig. 2. Reconstruction of particle hologram by numerical focusing compressive holography

Fig. 3. Focusing curves TC_BP and TC_BP_CS corresponding to focus values under different reconstruction distances

Fig. 4. Results of particle holograms reconstructed by different algorithms. (a)--(c) Traditional back-propagation method; (d)--(f) numerical focusing compressive hographic algorithm

Fig. 5. Recording and compressive holography reconstruction of in-line digital holography

Fig. 6. Focusing curves GRA_BP and GRA_BP_CS correspond to the respective focus values at the simulated reconstruction distance

Fig. 7. Digital holographic reconstruction of USAF-1951 information. (a) Reconstructed USAF-1951 information using traditional back-propagation method at z'_f2=1540 μm; (b) USAF-1951 grayscale image conrresponds to Fig. (a); (c) reconstructed USAF-1951 information using numerical focusing compressive hographic algorithm at z'_f3=1550 μm; (d) USAF-1951 grayscale image corresponds to Fig. (c)