Source: http://www.google.com/patents/US8174744?dq=4052565
Timestamp: 2015-01-30 16:35:07
Document Index: 16867529

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 US8174744 - Video hologram and device for reconstructing video holograms - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThe 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...http://www.google.com/patents/US8174744?utm_source=gb-gplus-sharePatent US8174744 - Video hologram and device for reconstructing video hologramsAdvanced Patent SearchPublication numberUS8174744 B2Publication typeGrantApplication numberUS 12/902,309Publication dateMay 8, 2012Filing dateOct 12, 2010Priority dateNov 13, 2002Also published asCN1711509A, CN100437393C, CN101349889A, CN101349889B, CN102520604A, DE10353439A1, DE10353439B4, DE50311875D1, EP1563346A2, EP1563346B1, EP2138910A2, EP2138910A3, EP2138911A2, EP2138911A3, US7315408, US7839548, US7924484, US7929189, US8027071, US8314981, US8384974, US20060055994, US20060238836, US20060238837, US20060238838, US20060238839, US20060238840, US20060238843, US20060238844, US20080252950, US20110026089, US20110304895, US20130265626, WO2004044659A2, WO2004044659A3Publication number12902309, 902309, US 8174744 B2, US 8174744B2, US-B2-8174744, US8174744 B2, US8174744B2InventorsArmin SchwerdtnerOriginal AssigneeSeereal Technologies GmbhExport CitationBiBTeX, EndNote, RefManPatent Citations (31), Non-Patent Citations (20), Classifications (21), Legal Events (1) External Links: USPTO, USPTO Assignment, EspacenetVideo hologram and device for reconstructing video hologramsUS 8174744 B2Abstract 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.
CROSS-REFERENCE TO RELATED APPLICATIONS This application is a division of U.S. application Ser. No. 10/534,877, filed May 12, 2005, which is the U.S. national phase of International Application No. PCT/DE2003/003791, filed Nov. 11, 2003, which is based on and claims priority to German Application No. DE 102 53 292.3, filed Nov. 13, 2002, the entire contents of which are hereby incorporated fully herein by reference.
BACKGROUND OF THE INVENTION The claimed invention relates to a video hologram and a device for reconstructing video holograms comprising an optical system, that consists of 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, the phase or amplitude of said opening being controllable, and a viewing plane located in the image plane of the light source.
Another possibility to generate large video holograms is provided by the so-called �tiling method�, using computer-generated holograms (CGH). In this method, known from WO 00/75698 A1 and U.S. Pat. No. 6,437,919 B1, small CGHs having a small pitch are composed with the help of an optical system. For this, in a first step, the required information is written to fast matrices having a small pitch (usually EASLM [electronically addressable spatial light modulators]), and then the matrices are reproduced on to a suitable holographic medium and composed to form a large video hologram. Usually, an optically addressable spatial light modulator (OASLM) is used as holographic medium. In a second step, the composed video hologram is reconstructed with coherent light in transmission or reflection.
In the CGH with controllable openings arranged in a matrix or in an otherwise regular pattern, known e.g. from WO 01/95016 A1 or Fukaya et al., �Eye-position tracking type electro-holographic display using liquid crystal devices�, Proceedings of EOS Topical Meeting on Diffractive Optics, 1997, the diffraction on small openings is taken advantage of for encoding the scenes. The wave fronts emerging from the openings converge in object points of the three-dimensional scene before they reach the viewer. The smaller the pitch, and thus the smaller the openings in the CGHs, the greater is the diffraction angle, i.e. the viewing angle. Consequently, with these known methods enlarging the viewing angle means to improve the resolution.
SUMMARY OF THE INVENTION The invention is defined in the claims. In one implementation, video holograms and devices for reconstructing video holograms with controllable openings according to the present invention are characterised 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, said frustum containing the entire three-dimensional scene as Fresnel transform of the video hologram.
DETAILED DESCRIPTION A device for reconstructing video holograms comprises the hologram-bearing medium, a sufficiently coherent, real or virtual, point or line-shaped 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 realised by an optical imaging system known in the art, consisting of a point or line laser or a sufficiently coherent light source.
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In JP vol. 62-C, Onoe/Kaneko.3"Combination enlargement method of viewing zone for computer-generated holography" SPIE vol. 3956 (2000), Mishina et al.4"Computational challenges of emerging novel true 3D holographic displays" SPIE vol. 4109 (2000), Cameron, Pain, Stanley, Stinger.5"Computer-generated Binary Holograms," IBM J.Res Develop, Brown/Lohmann.6"Electro-holographic Display using 15 mega pixels LCD" SPIE vol. 2652/15, Maeno et al.7"Expansion of the image size and viewing zone in holographic display using liquid crystal devices" SPIE vol. 2406/283, Fukaya et al.8"Eye-position tracking type electro-holographic display using liquid crystal devices" Asia Display '95, Fukaya et al.9"Introduction to Fourier Optics" p. 118/119, Goodman 2nd Ed.10"Viewing-zone enlargement method for sampled hologram that uses high-order diffraction" Applied Optics vol. 41 No. 8, Mishina et al.11English translation of Office Action, dated Aug. 30, 2007, issued in related Korean Application No. 10-2005-7008370.12English translation of Office Action, dated Dec. 28, 2007, issued in related Chinese Application No. 200380103105.X.13English translation of Office Action, dated Jan. 29, 2009, issued in related Korean Application No. 10-2008-7005127.14English translation of Office Action, dated May 25, 2006, issued in related Russian Application No. 2005118086/28 (020557).15European Search Report, dated Sep. 8, 2005, issued in related European Application No. 03 788 795.7 (German only).16Examination Report, dated Mar. 17, 2006, issued in related Indian Application No. 1221/CHENP/2005.17Examination Report, dated Sep. 2, 2008, issued in Philippine Application No. 1-2005-500748.18International Search Report, dated May 18, 2004, issued in priority International Application No. PCT/DE03/03791.19Office Action, dated Feb. 13, 2007, issued in Singapore Application No. 200502601-8.20Office Action, dated May 16, 2007, issued in related German Application No. 103 53 439.3-51 (in German with English translation).Classifications U.S. Classification359/9, 359/23, 359/32, 359/29International ClassificationG03H1/08, G03H1/22Cooperative ClassificationG03H2210/30, G03H2222/22, G03H2001/2271, G03H2001/2242, G03H2001/2236, G03H1/2286, G03H2226/05, G03H1/08, G03H2222/34, G03H2001/0858, G03H1/16, G03H1/2294European ClassificationG03H1/22, G03H1/08, G03H1/22SLegal EventsDateCodeEventDescriptionJul 20, 2011ASAssignmentFree format text: CHANGE OF ADDRESS;ASSIGNOR:SEEREAL TECHNOLOGIES GMBH;REEL/FRAME:026618/0688Owner name: SEEREAL TECHNOLOGIES GMBH, GERMANYEffective date: 20101213RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services