VIDEO HOLOGRAM AND DEVICE FOR RECONSTRUCTING VIDEO HOLOGRAMS
First Claim
1. A method for reconstructing a three-dimensional scene using a reconstruction device including a light source, an optical system and a hologram encoded on a hologram-bearing medium having a matrix of cells;
- the hologram-bearing medium and the optical system being illuminated by the light source; and
the optical system imaging the light source into an image plane of the light source;
the method comprising the steps of(i) the optical system generating an inverse Fourier transform of the hologram encoded on the hologram-bearing medium at the image plane of the light source;
(ii) providing a viewing window at the image plane of the light source, the viewing window being the location where an observer places at least one eye to view the holographic reconstruction representing the three-dimensional scene; and
(iii) forming the holographic reconstruction of the three-dimensional scene from the hologram encoded in the hologram bearing medium within a reconstruction frustum stretching between the hologram-bearing medium and the viewing window.
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Accused Products
Abstract
The invention relates to video holograms and devices for reconstructing video holograms, comprising an optical system having a light source, lens and the video hologram having cells arranged in a matrix or a regular pattern with at least one opening per cell, the phase or amplitude of said opening being controllable. The holographic video representations of expanded spatial objects can be achieved in a wide viewing area in real time using controllable displays, whereby the objects are either computer-generated or created by different means. The space-bandwidth product (SBP) of the hologram is thus reduced to a minimum and the periodicity interval of the Fourier spectrum is used as a viewing window on the inverse transformation plane, through which the object is visible in the preceding space. The mobility of the viewer(s) is achieved by tracking the viewing window.
27 Citations
26 Claims
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1. A method for reconstructing a three-dimensional scene using a reconstruction device including a light source, an optical system and a hologram encoded on a hologram-bearing medium having a matrix of cells;
- the hologram-bearing medium and the optical system being illuminated by the light source; and
the optical system imaging the light source into an image plane of the light source;
the method comprising the steps of(i) the optical system generating an inverse Fourier transform of the hologram encoded on the hologram-bearing medium at the image plane of the light source; (ii) providing a viewing window at the image plane of the light source, the viewing window being the location where an observer places at least one eye to view the holographic reconstruction representing the three-dimensional scene; and (iii) forming the holographic reconstruction of the three-dimensional scene from the hologram encoded in the hologram bearing medium within a reconstruction frustum stretching between the hologram-bearing medium and the viewing window. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
- the hologram-bearing medium and the optical system being illuminated by the light source; and
Specification