Patents by Inventor Ralf Haussler

Ralf Haussler has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20090180165
    Abstract: To compensate for an inhomogeneous brightness perception in a holographic reconstruction of 3D-scenes (4), a computing means encodes modulator cells of a SLM with a hologram point data pattern. Multiple bundles of rays illuminate the surface of the SLM and an array of focusing elements (21, 23) directs the bundles of rays to an observer's eye positions. Geometrical and optical properties of the array cause dissimilarly affected illumination regions on the SLM surface. The computing means determine parameters which describe the extent of these effects in combination with an expected spatial filtering at the eye pupil of the observer's eyes. Using these parameters, the computing means estimates which local errors of the reconstruction caused by these dissimilarly affected illumination regions will be perceived by the observer when watching the reconstruction, and corrects the hologram point data pattern such that the reconstruction appears at a corrected brightness uniformity level.
    Type: Application
    Filed: December 20, 2006
    Publication date: July 16, 2009
    Applicant: See Real Technologies S.A.
    Inventor: Ralf Haussler
  • Patent number: 7535607
    Abstract: A device for holographic reconstruction of three-dimensional scenes includes optical focusing means which directs sufficiently coherent light from light means to the eyes of at least one observer via a spatial light modulator that is encoded with holographic information. The device has a plurality of illumination units for illuminating the surface of the spatial light modulator (SLM); each unit comprises a focusing element (21/22/23 or 24), and a light means (LS1/LS2/LS3 or LS4) that emits sufficiently coherent light such that each of these illumination units illuminates one separate illuminated region (R1/R2/R3 or R4) of the surface, whereby the focusing element and the light means are arranged such that the light emitted by the light means (LS1-LS4) coincides close to or at the observer eyes.
    Type: Grant
    Filed: May 5, 2006
    Date of Patent: May 19, 2009
    Assignee: SeeReal Technologies S.A.
    Inventors: Armin Schwerdtner, Ralf Haussler, Norbert Leister
  • Publication number: 20080212153
    Abstract: The invention relates to a controllable illumination device for an autostereoscopic or holographic display, which illumination device contains an illumination matrix of primary light sources having at least one luminous element per light source and a controllable light modulator (SLM) and a reproduction matrix. A computer-generated hologram (CGH) illuminated by the primary light sources (11, . . . , 1n) is coded on the controllable light modulator (SLM) and generates, in at least one plane downstream of the SLM, a matrix—reconstructed from the computer-generated hologram (CGH)—of secondary light sources (2) having a secondary light distribution for the purpose of illuminating the reproduction matrix (4) and for the purpose of focussing in light bundles onto each eye of the viewer via an imaging matrix. The CGH is calculated and reconstructed on the basis of the number of and the positions of the viewers and the system parameters.
    Type: Application
    Filed: April 25, 2006
    Publication date: September 4, 2008
    Applicant: SEEREAL TECHNOLOGIES GMBH
    Inventors: Ralf Haussler, Armin Schwerdtner
  • Publication number: 20080198430
    Abstract: A method and a device for encoding and reconstructing computer-generated video holograms using a conventional LC display: it provides holographic reconstruction of three-dimensional scenes using electronically controllable pixel in a holographic array (3) with a conventional resolution, and is reasonably free from flickering and cross-talk. Reconstruction is in real time, and for both eyes at the same time, over a large viewing zone. The method takes advantage of an optical focusing means (2) in order to image vertically coherent light emitted by a line light source (1) into viewing windows (8R, 8L) after modulation by the pixel array (3). The holographic reconstruction (11) of the scene is rendered visible from viewing windows (8R, 8L) for both eyes of an observer by way of diffraction at the pixels.
    Type: Application
    Filed: April 29, 2008
    Publication date: August 21, 2008
    Applicant: SeeReal Technologies GmbH
    Inventors: Armin Schwerdtner, Ralf Haussler, Norbert Leister
  • Patent number: 7400431
    Abstract: A method and a device for encoding and reconstructing computer-generated video holograms using a conventional LC display: it provides holographic reconstruction of three-dimensional scenes using electronically controllable pixel in a holographic array (3) with a conventional resolution, and is reasonably free from flickering and cross-talk. Reconstruction is in real time, and for both eyes at the same time, over a large viewing zone. The method takes advantage of an optical focusing means (2) in order to image vertically coherent light emitted by a line light source (1) into viewing windows (8R, 8L) after modulation by the pixel array (3). The holographic reconstruction (11) of the scene is rendered visible from viewing windows (8R, 8L) for both eyes of an observer by way of diffraction at the pixels.
    Type: Grant
    Filed: September 8, 2005
    Date of Patent: July 15, 2008
    Assignee: SeeReal Technologies GmbH
    Inventors: Armin Schwerdtner, Ralf Haussler, Norbert Leister
  • Publication number: 20060250671
    Abstract: A device for holographic reconstruction of three-dimensional scenes includes optical focusing means which directs sufficiently coherent light from light means to the eyes of at least one observer via a spatial light modulator that is encoded with holographic information. The device has a plurality of illumination units for illuminating the surface of the spatial light modulator (SLM); each unit comprises a focusing element (21/22/23 or 24), and a light means (LS1/LS2/LS3 or LS4) that emits sufficiently coherent light such that each of these illumination units illuminates one separate illuminated region (R1/R2/R3 or R4) of the surface, whereby the focusing element and the light means are arranged such that the light emitted by the light means (LS1-LS4) coincides close to or at the observer eyes.
    Type: Application
    Filed: May 5, 2006
    Publication date: November 9, 2006
    Applicant: SeeReal Technologies
    Inventors: Armin Schwerdtner, Ralf Haussler, Norbert Leister
  • Publication number: 20060139711
    Abstract: A method of computing a hologram by determining the wavefronts at the approximate observer eye position that would be generated by a real version of an object to be reconstructed. In normal computer generated holograms, one determines the wavefronts needed to reconstruct an object; this is not done directly in the present invention. Instead, one determines the wavefronts at an observer window that would be generated by a real object located at the same position of the reconstructed object. One can then back-transforms these wavefronts to the hologram to determine how the hologram needs to be encoded to generate these wavefronts. A suitably encoded hologram can then generate a reconstruction of the three-dimensional scene that can be observed by placing one's eyes at the plane of the observer window and looking through the observer window.
    Type: Application
    Filed: December 21, 2005
    Publication date: June 29, 2006
    Applicant: SeeReal Technologies GmbH
    Inventors: Norbert Leister, Ralf Haussler, Armin Schwerdtner
  • Publication number: 20060050340
    Abstract: A method and a device for encoding and reconstructing computer-generated video holograms using a conventional LC display: it provides holographic reconstruction of three-dimensional scenes using electronically controllable pixel in a holographic array (3) with a conventional resolution, and is reasonably free from flickering and cross-talk. Reconstruction is in real time, and for both eyes at the same time, over a large viewing zone. The method takes advantage of an optical focusing means (2) in order to image vertically coherent light emitted by a line light source (1) into viewing windows (8R, 8L) after modulation by the pixel array (3). The holographic reconstruction (11) of the scene is rendered visible from viewing windows (8R, 8L) for both eyes of an observer by way of diffraction at the pixels.
    Type: Application
    Filed: September 8, 2005
    Publication date: March 9, 2006
    Inventors: Armin Schwerdtner, Ralf Haussler, Norbert Leister