In the single-step Lippmann holographic stereogram method, the images for exposing are calculated by perspective projection. The resolution of reconstructed images equals to the number of hogels and it is relatively low, especially for a small size hologram. In the infinite viewpoint camera method, the distance between the sampling camera and the holographic recording medium is far enough, so the light arriving at the hogels can be considered as bundles of parallel light approximately and the perspective images are transformed into the parallax related images firstly. In the two-step method, the master hologram (H 1 plate) should be optically recopied to the transfer hologram (H 2 plate), so the process is relatively complex with twice exposures and it is difficult to make a large-size hologram since we can hardly achieve large-format collimating light during the second exposure. 29, the infinite viewpoint camera method proposed by the researchers from Massachusetts Institute of Technology (MIT) 13, 30, the single-step Lippmann holographic stereogram method proposed by Yamaguchi’s group 31, 32, and the direct-write digital holography (DWDH) method reviewed by Bjelkhagen and Brotherton-Ratcliffe 11, 18, 33, 34. To achieve reconstructed images inside or outside the recording medium, there is the two-step method proposed by King et al. Synthetic holographic stereogram was first proposed by DeBitetto 15 and developed rapidly 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28. The parallax is changing when eyes are moving 15. When the observer’s left and right eyes are located at different viewing points, he will receive the corresponding perspective images with parallax information, then the stereoscopic vision occurs. With an appropriate illumination, each hogel will diffract a bundle of light rays, which are fractions of different perspective images, or just come from one perspective image within a certain viewing angle 14.
#Stereogram dinosaur series
A series of perspective images of the 3D scene are first captured by a tracking camera or modeled by a computer with rendering techniques, then they are exposed and stored in small holographic elements called hogels 13. Holographic stereogram printing is a kind of holographic technology 8, 9, 10, 11, 12. In recent years, it has been a research hotspot to realize three-dimensional (3D) display by using holographic technology 1, 2, 3, 4, 5, 6, 7.
#Stereogram dinosaur full
Numerical simulations and optical experiments are implemented, and the results demonstrate the validity of our analysis, and the optimized parameters of hogel sizes can improve the imaging quality of full parallax holographic stereogram effectively. The optimization of hogel sizes, i.e., the sampling interval of original perspective images and the printing interval of synthetic effective perspective images, are given for the optimized reconstruction. We also consider the flipping effect in spatial domain. The characteristic of the OTF with respect to the exit pupil size and the aberration are investigated in detail. To evaluate the imaging quality, the optical transfer function (OTF) of the holographic stereogram is modelled from the aspect of frequency response.
Based on our proposed method for holographic stereogram printing using effective perspective images’ segmentation and mosaicking (EPISM), we analyze the reconstructed wavefront errors, and establish the exit pupil function model of proposed printing system.
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