Fig. 1. Global reconstruction procedure of FPM.

Fig. 2. Block diagram of the gFPM method.

Fig. 3. Reconstruction results of different gradations in the gFPM method.

Fig. 4. (Color online) Intensity and phase SSIM curves varying with noise standard deviation and the reconstruction results of three methods with 7×10−4 noise standard deviation.

Fig. 5. (Color online) Phase SSIM curves with the overlap set as 0.4, 0.5, 0.6, and 0.7, and the reconstruction results of three methods with 0.6 overlap.

Fig. 6. Experimental setup. (a) The overall appearance of the system. (b) The high-performance sCMOS camera. (c) The controller of the LED array. (d) The customized LED array (only 13×13 elements used).

Fig. 7. Experimental results of the USAF target. (a) The FOV of the USAF target image. (b1) The enlarged ROI. (b2)–(b4) The reconstructed high-resolution intensities with the sequential method, global method, and GPU-gFPM method, respectively. (c1)–(c4) The intensity line traces corresponding to (b1)–(b4).

Fig. 8. Experimental results of an animal testis tissue. (a) The FOV of the specimen. (b) The enlarged ROI. (c1)–(c3) The reconstructed high-resolution intensities with the sequential method, global method, and GPU-gFPM method, respectively. (d1)–(d3) The reconstruction high-resolution phase images corresponding to (c1)–(c3).