Fig. 1. Intensity derivative diagram

Fig. 2. Schematic diagram of the angular spectrum iterative algorithm

Fig. 3. Schematic diagram of obtaining intensity difference by chromatic dispersion application in a single lens system

Fig. 4. Flow chart of hybrid phase retrieval algorithm

Fig. 5. Simulation experiment results. (a) Original phase; (b) In-focus intensity image; (c) Defocus intensity image; (d) Initial phase; (e) Final phase; (f) Comparison of the gray value of the transverse center line of the Fig.5(a) and (e)

Fig. 6. Comparison of TIE and hybrid algorithm. (a) Original phase; (b) Retrieval phases obtained by TIE algorithm; (c) Retrieval phases obtained by hybrid algorithm

Fig. 7. Practical intensity acquisition system

Fig. 8. Experimental result. (a) In-focus intensity image; (b) Defocus intensity image; (c) Phase by CD-HPR; (d) Thickness on the red line of (c); (e) 3D display