Video Hologram and Device for Reconstructing Video Holograms for Large Objects
First Claim
1. A display device for video holography, in which the device enables a holographic reconstruction of a three dimensional scene to be generated;
- the device including a light source and an optical system to illuminate a hologram-bearing medium encoded with a hologram;
wherein the size of the reconstructed three dimensional scene is a function of the size of the hologram-bearing medium and the reconstructed three dimensional scene can be anywhere within a volume defined by the hologram-bearing medium and a virtual observer window through which the reconstructed three dimensional scene must be viewed.
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Abstract
A video holographic display device operates so that the size of a reconstructed three dimensional scene is a function of the size of the hologram-bearing medium; the reconstructed three dimensional scene can then be anywhere within a volume defined by the hologram-bearing medium and a virtual observer window through which the reconstructed three dimensional scene must be viewed. This contrasts with conventional holograms, in which the size of the reconstructed scene is localised to a far smaller volume and is not a function of the size of the hologram-bearing medium at all.
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Citations
19 Claims
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1. A display device for video holography, in which the device enables a holographic reconstruction of a three dimensional scene to be generated;
- the device including a light source and an optical system to illuminate a hologram-bearing medium encoded with a hologram;
wherein the size of the reconstructed three dimensional scene is a function of the size of the hologram-bearing medium and the reconstructed three dimensional scene can be anywhere within a volume defined by the hologram-bearing medium and a virtual observer window through which the reconstructed three dimensional scene must be viewed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
- the device including a light source and an optical system to illuminate a hologram-bearing medium encoded with a hologram;
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18. A method of generating a holographic reconstruction of a three dimensional scene, made up of multiple discrete points, using a display device and a computer, the device including a light source and an optical system to illuminate a spatial light modulator;
- comprising the steps of;
(a) using the computer to encode a hologram on the spatial light modulator; (b) arranging the optical system and the hologram such that the size of the reconstructed three dimensional scene is a function of the size of the spatial light modulator because the reconstructed three dimensional scene is anywhere within a volume spanned by the spatial light modulator and a virtual observer window through which the reconstructed three dimensional scene must be viewed and (c) controlling the spatial light modulator such that, when a hologram comprises a region with information needed to reconstruct a single point in the three-dimensional scene, the point being visible from the virtual observer window, then the region (a) encodes information for that single point in the reconstructed three-dimensional scene and (b) 9s the only region in the hologram encoded with information for that point, and (c) is restricted in size to form a portion of the entire hologram, the size being such that multiple reconstructions of that point caused by higher diffraction orders are not visible at the virtual observer window. - View Dependent Claims (19)
- comprising the steps of;
Specification