Fig. 1. Schematic diagram of improved algorithm

Fig. 2. LeNet model structure

Fig. 3. Contrast simulation of two-dimensional Lena image. (a) Original image; (b) hologram obtained of the proposed algorithm; (c) hologram obtained by the algorithm in Ref.[22]; (d) reconstructed image of the proposed algorithm; (e) reconstructed image using the algorithm in Ref.[22]

Fig. 4. Small train model of modeling. (a) Depth map; (b) shading map

Fig. 5. Output image. (a) Phase-only hologram of three-dimensional small train; (b) reconstruction image of three-dimensional small train image

Fig. 6. Contrast simulation images. (a) Reconstructed image of proposed algorithm at d1=210 mm ; (b) reconstructed image at d1=210 mm using the algorithm in Ref.[22]; (c) reconstructed image of proposed algorithm at d2=220 mm; (d) reconstructed image at d2=220 mm using algorithm in Ref.[22]; (e) reconstructed image of proposed algorithm at d3=230 mm; (f) reconstructed image at d3=230 mm using the algorithm in Ref.[22]

Fig. 7. Experimental light path diagram

Fig. 8. Experiment reconstruction images. (a) Reconstructed image of the proposed algorithm at d1=210 mm; (b) reconstructed image at d1=210 mm using the algorithm inRef.[22]; (c) reconstructed image at d1=210 mm using the algorithm in Ref.[23]; (d) reconstructed image of the proposed algorithm at d2=220 mm; (e) reconstructed image at d2=220 mm using the algorithm in Ref.[22]; (f) reconstructed image at d2=220 mm using the algorithm in Ref.[23]; (g) reconstructed imageof the proposed algorithm at d3=230 mm; (h) reconstructed image at d3=230 mm using the algorithm in Ref.[22]; (i) reconstructed image at d3=230 mm using the algorithm in Ref.[23]

Table 1. PSNR and SSIM of reconstructed image

Table 2. SSIM of pure phase-only hologram

Table 3. Comparison of operation time of different size pictures