KEYWORDS: Holograms, Computer generated holography, 3D image reconstruction, 3D modeling, Reflection, 3D image processing, 3D displays, Diffraction, Transmittance, Holography
We present a computational method for image reconstruction with a high degree of reality from a computergenerated
hologram (CGH). As also seen in the field of computer-graphics, rendering methods are indispensable
techniques for displaying realistic 3D images from CGH. The proposed rendering algorithm takes into account
multiple reflection, transmission and shadow of lights among objects. Objects are expressed using the patch
model in this method. In the object-light calculation stage, reflection, transmission and shadow of incident light
are calculated on each patch. Propagations of these three lights to every other patch and a hologram are then
calculated. The incident light of a patch is the summation of these lights propagated from other patches and
illumination light, which lights up all the objects. Object-light on a hologram is sought from the summation of
all of the lights from each patch. In addition, we fabricate full-parallax CGHfs of 3D object models using this
method, and the reconstructed 3D holographic images are shown for demonstration purposes.
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