Fig. 1. Schematic of in-line holographic imaging.

Fig. 2. Simulation results of particles in 2D and 3D space

Fig. 3. The particle hologram after CS reconstruction identified by Hough transform and the auto-focusing evaluation results

Fig. 4. Experimental system for data collection

Fig. 5. Holograms of the sample collected in the experiment

Fig. 6. The reconstructed holograms using CS and BP algorithms

Fig. 7. Identification results of particles in gelatin by different methods