Source: http://www.google.com/patents/US7929189?dq=3657699
Timestamp: 2015-03-01 01:31:51
Document Index: 360995744

Matched Legal Cases: ['Application No. 10', 'Application No. 200380103105', 'Application No. 10', 'Application No. 2005118086', 'Application No. 03', 'Application No. 1221', 'Application No. 1', 'Application No. 200502601', 'Application No. 103']

Patent US7929189 - Video hologram and device for reconstructing video holograms using ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA geometrical method for working out how to encode a hologram onto a hologram bearing medium is disclosed. The method involves (a) selecting a point on the three dimensional scene to be reconstructed; then (b) defining a virtual observer window through which the reconstructed three dimensional scene...http://www.google.com/patents/US7929189?utm_source=gb-gplus-sharePatent US7929189 - Video hologram and device for reconstructing video holograms using geometrical calculationAdvanced Patent SearchPublication numberUS7929189 B2Publication typeGrantApplication numberUS 11/427,644Publication dateApr 19, 2011Filing dateJun 29, 2006Priority dateNov 13, 2002Fee statusPaidAlso published asCN1711509A, CN100437393C, CN101349889A, CN101349889B, CN102520604A, DE10353439A1, DE10353439B4, DE50311875D1, EP1563346A2, EP1563346B1, EP2138910A2, EP2138910A3, EP2138911A2, EP2138911A3, US7315408, US7839548, US7924484, US8027071, US8174744, US8314981, US8384974, US8941902, US20060055994, US20060238836, US20060238837, US20060238838, US20060238839, US20060238840, US20060238843, US20060238844, US20080252950, US20110026089, US20110304895, US20130265626, WO2004044659A2, WO2004044659A3Publication number11427644, 427644, US 7929189 B2, US 7929189B2, US-B2-7929189, US7929189 B2, US7929189B2InventorsArmin SchwerdtnerOriginal AssigneeSeereal Technologies GmbhExport CitationBiBTeX, EndNote, RefManPatent Citations (25), Non-Patent Citations (20), Referenced by (7), Classifications (20), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetVideo hologram and device for reconstructing video holograms using geometrical calculation
US 7929189 B2Abstract
A geometrical method for working out how to encode a hologram onto a hologram bearing medium is disclosed. The method involves (a) selecting a point on the three dimensional scene to be reconstructed; then (b) defining a virtual observer window through which the reconstructed three dimensional scene will be seen; then (c) tracing a pyramid from the edges of the observer window through the point and onto a region that forms only a portion of a hologram bearing medium; and finally (d) generating, solely in that region of the hologram-bearing medium, holographic information needed to generate a holographic reconstruction of the point.
1. A method of generating a sequence of holograms to be encoded into a hologram-bearing medium of a device comprising an optical system, at least one light source and the hologram-bearing medium having a matrix of cells, the optical system imaging the light source into an image plane of the light source, the method comprising the steps of:
(a) selecting a point in the three dimensional scene to be reconstructed;
(b) defining an observer window through which the reconstructed three dimensional scene will be seen; the maximal extent of the observer window corresponding to a periodicity interval in the plane of the inverse Fourier transformation of the hologram-bearing medium in the image plane of the light source;
(c) tracing a pyramid from the edges of the observer window through the point and onto a region that forms only a portion of a hologram bearing medium;
(d) encoding, solely in that region of the hologram-bearing medium, a hologram needed to generate a holographic reconstruction of the point, the region being variable in position and size, the position and the size of the region depending on the location of the point and on the location of the observer window.
2. The method of claim 1 in which the reconstructed three dimensional scene comprises multiple such points.
3. The method of claim 1 in which the hologram is illuminated by a light source and an optical system such that only when an observer's eye is positioned approximately at the image plane of the light source can the holographic reconstruction be seen properly.
4. The method of claim 1 in which the reconstructed point is visible from a defined viewing position, and is characterized in that:
the region (a) encodes information for that reconstructed point and (b) is the only region in the hologram-bearing medium encoded with information for that point, and (c) is restricted in size to form a portion of the entire hologram-bearing medium, the size being such that multiple reconstructions of that point caused by higher diffraction orders are not visible at the defined viewing position.
5. The method of claim 1 comprising the step of generating the hologram by time sequentially re-encoding a hologram on the hologram-bearing medium for the left and then the right eye of an observer.
6. The method of claim 1 in which the holographic reconstruction of the point is the Fresnel transform of the hologram and not the inverse Fourier transform of the hologram.
7. The method of claim 1 in which the encoding is such that, on reconstruction, an inverse Fourier transform of the hologram is generated at a viewing plane at which the observer's eyes must be placed.
8. The method of claim 1 in which the three dimensional scene is reconstructable anywhere within a volume defined by the hologram bearing medium and the observer window.
9. The method of claim 1 in which the observer window is smaller than the hologram-bearing medium.
10. The method of claim 1 in which there are separate observer windows, one for each eye of an observer.
11. The method of claim 10 in which each observer window is approximately 1 cm�1 cm.
12. The method of claim 1 in which the location of an observer's eyes are tracked and the position of the observer windows is altered so that the observer can maintain a view through each observer window even when moving his or her head.
13. The method of claim 1 in which the size of the observer window is calculated as a function of the periodicity interval of the hologram bearing medium.
14. The method of claim 1 in which the hologram bearing medium is a TFT flat screen.
15. The method of claim 1 in which the hologram-bearing medium is a display screen in a television.
16. The method of claim 1 in which the hologram-bearing medium is a display screen in a multimedia device.
17. The method of claim 1 in which the hologram-bearing medium is a display screen in a gaming device.
18. The method of claim 1 in which the hologram-bearing medium is a display screen in a medical image display device.
19. The method of claim 1 in which the hologram-bearing medium is a display screen in a military information display device.
20. A holographic reconstruction generated from a hologram encoded using the method defined in claim 1.
21. A computer adapted to generate a sequence of holograms to be encoded into a hologram-bearing medium of a display device using the method defined in claim 1.
22. A method of generating a holographic reconstruction of a three dimensional scene using a display device and a computer, the device including a light source and an optical system to illuminate a hologram-bearing medium; comprising the steps of:
(a) using the computer to encode a hologram on the hologram-bearing medium; the hologram having been generated using the method of claim 1;
(b) illuminating the hologram bearing medium using the light source and optical system so that the reconstructed three dimensional scene is visible.
23. The sequence of holograms generated by the method according to claim 1.
24. A display device for generating a holographic reconstruction of a three dimensional scene, the display device comprising an optical system, that at least one light source and a hologram-bearing medium, the optical system imaging the light source into an image plane of the light source, the hologram-bearing medium being encoded with a sequence of holograms, the sequence of holograms being generated by using the method defined in claim 1. Description
This application is a divisional application of U.S. patent application Ser. No. 10/534,877 filed by A. Schwerdtner on May 12, 2005 entitled �Video Hologram and Device for Reconstructing Video Holograms�, the contents of which are hereby incorporated by reference.
The present invention relates to a video hologram and a device for reconstructing video holograms having an optical system that includes at least one light source, a lens and a hologram-bearing medium composed of cells arranged in a matrix or an otherwise regular pattern, with at least one opening per cell, and with the phase or amplitude of the opening being controllable.
Devices for reconstructing video holograms using acousto-optical modulators (AOM) are known from prior art, as detailed in, for instance, U.S. Pat. No. 5,172,251 issued to Benton et al. on Dec. 15, 1992 entitled �Three dimensional display system,� the contents of which are hereby incorporated by reference. Such acousto-optical modulators transform electric signals into optical wave fronts, which are recomposed in a video frame using deflection mirrors to form two-dimensional holographic areas. A scene visible for the viewer is reconstructed from the individual wave fronts using further optical elements. The optical means used, such as lenses and deflection elements, have the dimensions of the reconstructed scenes. Due to their great depth, these elements are voluminous and heavy. It is difficult to miniaturize them, so that their range of applications is limited.
The invention is defined in claim 1. In one implementation, video holograms and devices for reconstructing video holograms with controllable openings according to the present invention are characterized in that in the viewing plane at least one viewing window is formed in a periodicity interval as a direct or inverse Fourier transform of the video hologram, said viewing window allowing a viewer to view a reconstruction of a three-dimensional scene. The maximal extent of the viewing window corresponds to the periodicity interval in the plane of the inverse Fourier transformation in the image plane of the light source. A frustum stretches between the hologram and the viewing window. This frustum contains the entire three-dimensional scene as a Fresnel transform of the video hologram.
An embodiment of the present invention is illustrated and explained below in conjunction with the accompanying drawings, wherein
A device for reconstructing video holograms comprises the hologram-bearing medium, a sufficiently coherent, real or virtual, point or line light source and an optical system. The video hologram-bearing medium itself consists of cells which are arranged in a matrix or in an otherwise regular pattern with at least one opening per cell, the phase or amplitude of said opening being controllable. The optical system for reconstructing the video hologram can be realized by an optical imaging system known in the art, consisting of a point or line laser or a sufficiently coherent light source.
FIG. 1 shows the general arrangement of a video hologram and its reconstruction. A light source 1, a focusing lens system 2, shown as a single lens, for the purpose of simplicity, a hologram-bearing medium 3 and a viewing plane 4 are arranged one after another, seen in the direction of the propagating light. The viewing plane 4 corresponds with the Fourier plane of the inverse transform of the video hologram with the diffraction orders. FIG. 1A shows the content of FIG. 1 with a magnified view of an example of a focusing lens system 2 comprising two single lenses.
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