Seereal Technologies Gmbh

Seereal Technologies S.a.

Technische Universitaet Dresden

Armin Schwerdtner

Bo Kroll

Ralf Haussler

Norbert Leister

Alexander Schwerdtner

Gerald Futterer

Jean-Christophe Olaya

Enrico Zschau

Steffen Buschbeck

Holger Heidrich

Stephan Reichelt

Stanislas Flon

Ralf Häussler

Sebastien Amroun

Gerald FÜTTERER

A method for generating video holograms in real time for a holographic playback device comprising at least one light modulator means, into which a scene divided into object points is encoded as an entire hologram and can be seen as a reconstruction from a visibility region, which is located within a periodicity interval of the reconstruction of the video hologram, the visibility region defining a subhologram together with each object point of the scene to be reconstructed, and the entire hologram being generated from a superposition of contributions of subholograms, is characterized in that for each object point the contributions of the subholograms in the entire reconstruction of the scene can be determined from at least one look-up table.

Method for generating a head up display for an aircraft using video holograms in real time with the help of sub-holograms

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.

Devices and methods for generating a holographic reconstruction of an object

A method of computing a hologram for reconstructing an object using a display device. The display device enables a holographic reconstruction of the object. The display device includes a light source and an optical system to illuminate a hologram-bearing medium being encodable with the hologram. The method includes the steps of: (a) computing the hologram by determining the wavefronts at an approximate observer eye position that would be generated by a real version of the object to be reconstructed; and (b) encoding the computed hologram in the hologram-bearing medium.

Method of computing a hologram for reconstructing an object using a display device

A holographic reconstruction of scenes includes a light modulator, an imaging system with at least two imaging means and an illumination device with sufficient coherent light for illumination of hologram coded in the light modulator. The at least two imaging means are arranged such that a first imaging means is provided for the magnified imaging of the light modulator on a second imaging means. The second imaging means is provided for imaging of a plane of a spatial frequency spectrum of the light modulator in a viewing plane at least one viewing window. The viewing window corresponds to a diffraction order of the spatial frequency spectrum.

Projection device and method for the holographic reconstruction of scenes

Method and a display device for generating a holographic reconstruction of an object

Method of generating a holographic reconstruction of an object using observer tracking

Projection device and method for holographic reconstruction of scenes

Display device for displaying a reconstruction of an object

Method of computing a hologram

The invention relates to a method and device for tracking the sweet spots of a sweets spot unit for a transmissive electronic display. The aim of the invention is to improve the reproduction quality and the uniformity of illumination in displays of this type. The display contains a sweet spot unit consisting of an illumination matrix () and reproduction elements, in addition to an image matrix (). Once the position of at least one observer's eye () has been determined by a control unit using inverse ray tracing, address data for activating illumination elements (LE) of the illumination matrix () is provided from the position data in order to prepare the defined sweet spots () for said observer's eye (). To improve the reproduction quality, an additional optical component is used in ray path for the inverse ray tracing process. In addition to the viewing angle (&#x3b1;) of the observer, the control unit detects and takes into consideration a defined angle (&#x3b8;) of a scattering or diffractive element in a predetermined angular range. The permits additional address data to be activated for the illumination elements (LE) and the defined sweet spot () can be illuminated in a uniform manner.

Method and device for tracking sweet spots

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; each unit comprises a focusing element, and a light means that emits sufficiently coherent light such that each of these illumination units illuminates one separate illuminated region of the surface, whereby the focusing element and the light means are arranged such that the light emitted by the light means coincides close to or at the observer eyes.

Device for holographic reconstruction of three-dimensional scenes

A method for generating video holograms for a holographic reproduction device with at least one light modulation means, wherein a scene split into object points is encoded as a whole hologram and can be seen as a reconstruction from a visibility region, which is located within a periodicity interval of the reconstruction of the video hologram. The visibility region, together with each object point of the scene to be reconstructed, defines a subhologram and the whole hologram is generated from a superposition of subholograms, wherein in a sequence of image contents the difference subholograms of object points are preferably generated for each picture, differing in regards to the visibility according to the viewer position in sequential images of the sequence. The display device comprises means that provide high-quality video holograms in spite of the data amount being significantly reduced.

Method for generating video holograms for a holographic display device with random addressing

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Dresden, Germany

Armin Schwerdtner