Abstract
The volume hologram printer is useful for 3D display, because it is selective to the wavelength and be able to reconstruct with the natural illumination. There are many studies of a volume hologram printer been studied to output a volume hologram from a computer-generated hologram. The final volume hologram consists of tiled small holograms and the tiling manner often causes spilt lines which will have impact on image quality. With an intent to get rid of the split lines and improve the quality, fully overlapping printing was proposed recently. Each elemental hologram is overlapped both in vertical and horizontal directions by 50%. Then, the hologram is printed four times in each area and it makes the printing speed four times slower. For this case, partially overlapping printing is proposed in this paper to improve image quality with small effect in printing speed. For partial overlapping, a digital spatial filter is projected and added to every elemental hologram. Using the digital spatial filter, different partially overlapped holograms are calculated and reconstructed to compare to the non-overlapped ones. The simulation result shows that the overlapped one (10% in both vertical and horizontal) has much weaker gaps and black lines.
Highlights
Various kinds of hologram printers have been studied [1,2,3], and holographic stereogram printers have been studied for many years and commercialized by several companies [1,2]
The main principle of a volume hologram printer is a reconstructed image from the plane computer-generated holograms (CGH) which is optically transferred to a photo-sensitive material as the volume reflection hologram [3]
To improve the image quality of volume hologram printer, partial overlapping with 10% in both vertical and horizontal directions approach multiplied with a digital spatial filter is proposed in this paper
Summary
Various kinds of hologram printers have been studied [1,2,3], and holographic stereogram printers have been studied for many years and commercialized by several companies [1,2]. The main principle of a volume hologram printer is a reconstructed image from the plane CGH which is optically transferred to a photo-sensitive material as the volume reflection hologram [3]. If the mm order’s transferred holograms are overlapped partially, there will be a strong intensity non-uniformity (higher intensity in the overlapped parts than the non-overlapped parts) that causes the split lines and reduces the quality. With this in mind, a digital filter is applied to the overlapping area to control image intensity. The partial overlapping is described in more detail, and the results of the numerical simulation show that the digital filter is feasible to improve the image quality
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