Computer generated rainbow holographic stereogram
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.
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