Fig. 1. Average-sized RBC: (a) 3D model; (b) cross section.

Fig. 2. Phase reconstruction of a RBC using derivative method in off-axis interferometry: (a) and (b) two phase-shifted interferograms; (c) and (d) first-order derivatives of (a) and (b), respectively; (e) and (f) second-order derivatives of (a) and (b), respectively; (g) and (h) 2D display and 3D display, respectively, of the reconstructed phase; (i) thickness distribution.

Fig. 3. Reconstructed phase of a RBC obtained by the following: (a) Hilbert transform, 2D display map; (b) twice filters algorithm, 2D display map; (c) Hilbert transform, 3D display map; (d) twice filters algorithm, 3D display map.

Fig. 4. Reconstructed phase maps with different algorithms in slight off-axis interferometry: (a) Hilbert transform; (b) twice filters algorithm; (c) our method.

Fig. 5. Phase reconstruction of a RBC using derivative method in on-axis interferometry: (a) interferogram; (b) first-order derivative; (c) second-order derivative; (d) 2D display of the reconstructed phase; (e) 3D display of the reconstructed phase.

Table 1. Phase Shift Extraction and the Calculated Thickness

Table 2. Standard Deviation, MSE, and Processing Time with Different Approaches