US 2022/0357702 A1Published application

Method of computing a hologram

AssigneeSeeReal Technologies S.A.

InventorsNorbert LEISTER, Ralf HAUSSLER, Armin SCHWERDTNER

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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.

Claims35

Dependent claims

A method for computing a computer-generated video hologram, where object data defining objects in a three dimensional scene is arranged into a number of virtual section layers, each layer defining a two-dimensional object data set, such that a video hologram data set can be calculated from some or all of these two-dimensional object data sets;

comprising the following steps:
(a) in a first transformation, each two-dimensional object data set of the virtual section layers is transformed to a two-dimensional wave field distribution,
(b) the calculated two-dimensional wave field distributions, for all two-dimensional object data sets of section layers, are added to define an aggregated data set
(c) wherein the first transformation comprises one of (a) applying a Fourier transformation and a first phase factor describing a spherical wave, and (b) applying a Fresnel transformation, and
(d) wherein the object data sets may exhibit an appropriate phase distribution or a pseudo-random phase distribution, in order to reduce speckle noise or to enhance at least one of:
brightness efficiency, diffraction efficiency and brightness definition in the reference layer of the scene.

3 more elements

A digital signal processing device for computing computer-generated video holograms with digital slicer means, which assigns object data defining objects in a three dimensional scene to a number of virtual section layers, each section layer defining a separate object data set, such that a video hologram data set for a video hologram can be calculated from some or all of these object data sets, containing:

(a) first transformation means for computing from each object data set a separate, two-dimensional wave field distribution, and buffer memory means for buffering transformed object data sets,
(b) adding means for adding the transformed object data of all section layers to generate a wave field expression of an aggregated data set,
(c) wherein the first transformation comprises one of (a) applying a Fourier transformation and a first phase factor describing a spherical wave, and (b) applying a Fresnel transformation, and
(d) wherein the object data sets may exhibit an appropriate phase distribution or a pseudo-random phase distribution, in order to reduce speckle noise or to enhance at least one of:
brightness efficiency, diffraction efficiency and brightness definition in the reference layer of the scene.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/813,176Filed 18 Jul 2022
Priority: DE 10 2004 06383823 Dec 2004
Published: 10 Nov 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification24 codes

G03H 1/0808
Synthesising holograms, i.e. holograms synthesized from objects or objects from holograms: methods of numerical synthesis, e.g. coherent ray…
G03H 1/0005
Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them;…
G03H 1/2294
Processes or apparatus for obtaining an optical image from holograms: addressing the hologram to an active spatial light modulator
G03H 1/268
Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique: holographic…

Family

Application11/313,989Continuation · filed 21 Dec 2005
Application14/330,793Continuation · filed 14 Jul 2014
Application15/679,228Continuation · filed 17 Aug 2017
Application16/545,330Continuation · filed 20 Aug 2019
Application17/813,176Continuation
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