Computer generated rainbow holographic stereogram

Hiroshi Yoshikawa and Kenji Sugawara

more images below!
This photo shows reconstructed image from the hologram.

ABSTRACT (Presented as a regular paper for the Topical Meeting on "Optics for Information Infrastructure" (OII'98) of the International Commission for Optics (ICO), which was held in Tianjin, China, August 3-6, 1998. )

We have proposed simplified model to calculate the computer generated rainbow hologram, which can reconstruct 3D image with white light. In the previous paper, the hologram is composed as the Fresnel hologram. In this paper, we apply stereographic approach to the computer generated rainbow hologram. We have made full color computer generated rainbow holographic stereograms from image arrays of 2D images.



The computed holograms, whose pixel numbers are 5,120 x 4,096, are printed by a laser printer. The hologram consists of 80 elemental holograms in horizontal direction, and 128 hololines in vertical direction. The computational time for the image array transformation is about 2.1 seconds for each primary color, and the Fourier transform takes about 5.5 seconds for each primary color on Sun Sparc Station 5 (clock: 170MHz). Then, the images of the holographic fringe are taken by a single lens reflection camera with Fuji's "Minicopy film." The size of the exposed hologram on the film is about 15 mm x 12 mm. Therefore, pixel size of the hologram becomes roughly 2.9 microns square.



These pictures also illustrate the white light reconstructed image from the full color CGRHS. The object consists of three shapes, cone, cube and sphere, floating above a checkerboard. The pixel numbers are 10,240 x 6,144 and the size of the final hologram is 35 mm x 21 mm. When observed about 1 m from the hologram, one can recognize binocular parallax.


(Made by Akihito Kagotani)

CGRHS can be made from real sight also. This pictures shows the white light reconstructed image from the full color CGRHS. The hologram is calculated from the image array taken by CCD video camera, which was moved side to side to shoot images from different viewpoints. The pixel numbers are 9,600 x 6,144 and the size of the final hologram is 35 mm x 21 mm.


For further information, please write to:
hiroshi@panda.ecs.cst.nihon-u.ac.jp