Hologram bandwidth reduction and size change of 3D images for visual display
2004
A method of hologram bandwidth reduction and a method of size change of a 3D image are described. Spatial
frequency bands of a Fourier-transform hologram (FTH) are superimposed for reduction of the bandwidth and for
production of a continuous periodic FTH. Resolution of the image is improved by the superimposing method. The
second hologram for reconstruction of the magnified 3D image is produced by connecting a number of small holograms
clipped from the original FTH. Image depth capable of magnification is extended using several FTHs. Experiments
using the CGH shows that depth of the 3D image can be perceived by watching images reconstructed on many Fouriertransform
planes with different distances from the hologram. It is also shown that numbers of rays of light illuminated
from the second hologram reconstruct similar 3D images of various sizes of the same object. Distortion of the image
due to the magnification can be avoided over the wide range of magnifying power.
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