Fig. 1. Schematic of lens-free CMI method.

Fig. 2. Flowchart of the proposed method.

Fig. 3. (a) The amplitude and (b) phase distribution of O(x,y) of the RPP obtained with the ePIE algorithm.

Fig. 4. Recorded diffraction pattern and field reconstructions for the incident beam. (a) The diffraction pattern recorded by CCD, (b) the Fourier components of the exit incident beam, (c) reconstructed amplitude and (d) phase distribution of illumination on the RPP plane. (e) Obtained amplitude and (f) phase distribution of the incident beam.

Fig. 5. Recorded diffraction pattern and reconstructed fields when a biological specimen (a pumpkin stem) is used as the sample. (a) The diffraction pattern recorded by CCD, (b) the Fourier components of the exit wave field of the sample, (c) the reconstructed amplitude, and (d) the phase distribution of illumination on the RPP. The reconstructed (e) amplitude and (f) phase distribution of the sample.

Fig. 6. Convergence curves obtained as a function of the number of iterations with different parameters of rn, α, and β.

Fig. 7. USAF 1951 target is placed at the sample plane. The reconstructed (a) amplitude and (b) phase distribution of the transmitted field of the USAF 1951 target.