7 February 2011 Computer-generated "alcove" hologram to display floating image with wide viewing angle
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In this paper, we have investigated the floating image display with the computer-generated hologram (CGH). As the 3D display, to make strong impression on the viewer, the display should reconstruct the floating image from the display plane. However, there are few reports about the floating image display with the CGH. Since the required spatial frequency to the display is very high compared with the rear image display, it is difficult to output the CGH which display the floating image. If the CGH is output by the inadequate device, the viewing area and the image size of the CGH is limited. Therefore, to reduce the required spatial frequency for the fringe pattern of the CGH, the position of the object is placed at the behind of the hologram plane. Also, the huge calculation amount of the fringe pattern is a big problem. In our work, since we developed our output device (named fringe printer) for the fringe pattern, the pixel pitch of the printed fringe pattern achieves to 0.44 μm. By using the fringe printer, we have obtained the floating image with the CGH. The output CGH can reconstruct the floating image, but the reconstructed image only has the narrow viewing angle and the small image size. To make the wide viewing angle floating image display, we investigate to change the CGH shape from the flat type to curved type. Also, to solve the huge calculation amount, we employ the GPU for parallel calculation to make the computation faster.
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Takeshi Yamaguchi, Takeshi Yamaguchi, Hiroyuki Ozawa, Hiroyuki Ozawa, Hiroshi Yoshikawa, Hiroshi Yoshikawa, } "Computer-generated "alcove" hologram to display floating image with wide viewing angle", Proc. SPIE 7957, Practical Holography XXV: Materials and Applications, 795719 (7 February 2011); doi: 10.1117/12.876353; https://doi.org/10.1117/12.876353

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