## 4 Experimental Verification
The synthetic perspective image used to expose the hogel on the H\({}_{2}\) plate needs to be flipped horizontally, because the LCD panel corresponding to the virtual H\({}_{1}\) plate and the LCD panel corresponding to the H\({}_{2}\) plate were in the opposite direction. Equation \(T_{e}=E/(P_{s}+P_{r})\) was used to express the exposure time, where \(P_{s}\) is the intensity of signal beam energy, \(P_{r}\) is the intensity of reference beam energy, and \(E\) denotes as the light sensitivity of holographic plate. In this experiment, \(E=1250\;\upmu\mathrm{J}/\mathrm{cm}^{2}\), \(P_{s}=10\;\upmu\mathrm{J}/\mathrm{cm}^{2}\), \(P_{r}=300\;\upmu\mathrm{J}/\mathrm{cm}^{2}\). The energy ratio between \(P_{s}\) and \(P_{r}\) was selected as 1:30; this ratio can greatly reduce the printing time on the premise of guaranteeing the image quality, and the exposure time was \(T_{e}=4\;\mathrm{s}\). The waiting time was 4 times as much as exposure time to reduce the vibration result, and the waiting time \(T_{w}=16\;\mathrm{s}\). The printing time was the sum of exposure time and waiting time, the hogel's printing time \(T_{h}=T_{e}+T_{w}=20\;\mathrm{s}\), and total printing time \(T_{t}=T_{h}\times N_{H_{2}}\times N_{H_{2}}=18,000\;\mathrm{s}\). Figure 11 shows the reconstruction images of an optical experiment result. A conjugate beam of reference beam was used to illuminate the holographic plate, and a camera used to record the reconstruction image of holographic plate. Its model is Canon EOS 5D-mark3 DS126091, the focal length of camera lens is 100 mm, the camera was set 50 cm away from holographic plate, and a real image of 3D scene was captured by camera. Figure 11: Optical reconstruction images in different viewing position obtained by experiments. Figure 10: The optical setup of the synthetic holographic stereogram printing system. As shown in Figure 11, by the effective display size and the distance \(L_{2}\), the FOV of H\({}_{2}\) plate is about 30\({}^{\circ}\). The details of the original scene are perfectly reproduced, and full parallax information can be presented by the holographic element-based EPISM method. When the camera position is close to the limited FOV, due to the use of simple camera sampling, the reconstructed scene is as incomplete as the original scene, with the observation area unable to achieve 30\({}^{\circ}\) FOV. To confirm the position of reconstructed image, we put two rulers together with the holographic plate. A camera was put 50 cm away from holographic plate, and the result is shown in Figure 12. The position relation of the rulers and holographic plate are shown in Figure 12a; the ruler on the left side is on the same plane as the holographic plate, and the ruler on the right side is on the position of the reconstruction image, away from the holographic plate by 18.6 cm. In Figure 12b, focusing on the left ruler, both the figure on the ruler and the hogel on holographic plate are clear, and the figure on the right ruler is blurred. In Figure 12c, focusing on the right ruler, the figure on the ruler and the map on the reconstruction image are clear, and the left ruler is blurred. As shown in Figure 13, the camera was also put in the position 50 cm away from the holographic plate; an EPISM method holographic stereogram was made according to the same configuration. Comparing the reconstructed images obtained by the EPISM method and the holographic element-based EPISM method, Figure 13a shows the position relation of rulers and the holographic plate; the farther ruler is placed in the position of the reconstruction image, with the ruler as far from the holographic plate as 18.6 cm, and the closer ruler is placed 1.5 cm behind the position of the farther ruler. Figure 13b,c show the reconstruction images of the EPISM method.