Fig. 1. Schematic diagrams of double exposure principle. (a) Schematic diagram of double exposure iteration^[13]; (b) simulation flowchart of influence of shelters; (c) schematic diagram of Tukey window function

Fig. 2. Schematic diagram of experimental setup

Fig. 3. Actual photos of imaging targets. (a) Lateral resolution is 0.2 mm; (b) lateral resolution is 0.3 mm

Fig. 4. Experimental results of paper parameter measurement. (a) Illumination light image; (b) average hologram of 60 frames of single B5 paper; (b2) reconstructed amplitude image and (b3) histogram of single B5 paper after single exposure APRA and cutting; (c1) average hologram of 60 frames of thermal paper; (c2) reconstructed amplitude image and (c3) histogram of thermal paper after single exposure APRA and cutting

Fig. 5. Experimental results of detector noise measurement. (a) Image of double-layer B5 paper on detector surface; (b) corresponding histogram and Gaussian fitting curve

Fig. 6. Target scenes, holograms, and reconstructed amplitude images of target with lateral resolution of 0.2 mm. (a1)--(a5) No shelter; (b1)--(b5) thermal paper shelter; (c1)--(c5) B5 paper shelter

Fig. 7. Target scenes, holograms, and reconstructed amplitude images of target with lateral resolution of 0.3 mm. (a1)--(a3) No shelter; (b1)--(b3) thermal paper shelter; (c1)--(c3) B5 paper shelter

Fig. 8. Normalized holograms and reconstructed amplitude images of target with lateral resolution of 0.2 mm. (a1)(a2) B5 paper shelter; (b1)(b2) thermal paper shelter; (c1)(c2) no shelter

Fig. 9. Normalized holograms and reconstructed amplitude images of the target with a lateral resolution of 0.3 mm.(a1)(a2) B5 paper shelter; (b1)(b2) thermal paper shelter

Fig. 10. Reconstructed amplitude image of target with lateral resolution of 0.3 mm

Table 1. Mean value and contrast ratio calculated from simulation results

Table 2. Mean value and contrast ratio calculated from experimental results