29 June 2004 Computer-generated holograms considering multiple reflection, transmission, and shadow on object surfaces
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Abstract
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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Kazuya Ezura, Yuji Sakamoto, Yoshinao Aoki, "Computer-generated holograms considering multiple reflection, transmission, and shadow on object surfaces", Proc. SPIE 5290, Practical Holography XVIII: Materials and Applications, (29 June 2004); doi: 10.1117/12.526443; https://doi.org/10.1117/12.526443
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