US 2023/0259071 A1 · DEVICE AND METHOD FOR CALCULATING HOLOGRAPHIC DATA

Abstract

An apparatus and a method for optimized calculation of 2D sub-holograms for object points of a three-dimensional scene and a pipeline for real-time calculation of holograms are provided. The invention shortens the calculation time of a hologram for representing a three-dimensional scene and/or to reduce the calculation complexity of such a hologram. This is achieved by a 2D sub-hologram of an object point, which has image elements of the spatial light modulator, comprises a half 1D sub-hologram, where the radius of each image element is determined and each image element of the 2D sub-hologram is fixedly assigned to at least one image element of the half 1D sub-hologram with identical or similar radius by way of an electronic circuit, by a method for encoding a hologram, and by a pipeline on the basis of FPGA and/or ASIC.

Claims17

Dependent claims

A method for calculating a 2D sub-hologram for representing an object point of a three-dimensional scene using a holographic display comprising a spatial light modulator with a matrix of image elements, wherein each 2D sub-hologram contains image elements of the spatial light modulator and wherein the method utilizes a rotational symmetry of the 2D sub-hologram in order to encode the 2D sub-hologram into the spatial light modulator, in which

assigning each image element of the 2D sub-hologram to at least one image element of a half 1D sub-hologram having an identical or similar radius value, wherein the half 1D sub-hologram extends along a section through the 2D sub-hologram from the origin of the 2D sub-hologram up to a maximum radius of the 2D sub-hologram,
calculating values for phase and amplitude for each image element of a half 1D sub-hologram and transferring to all respectively assigned image elements of the 2D sub-hologram,
realizing the assignment of the image elements of the 2D sub-hologram to the image elements of the half 1D sub-hologram in a fixedly encoded manner by way of an electronic circuit.

A method for encoding a hologram of a three-dimensional scene in a spatial light modulator of a holographic display using addition of sub-holograms of individual object points, comprising:

calculating a sub-hologram segment of a first half of a sub-hologram with a defined segment width for a hologram row,
determining offset positions for the sub-hologram segment of the first half and for a sub-hologram segment of a second half of the sub-hologram, wherein the offset positions define the position within a hologram row at which the sub-hologram segments are added up,
generating the sub-hologram segment of the second half of the sub-hologram by duplication and mirroring of the sub-hologram segment of the first half,
including the sub-hologram segment of the first half and its offset position in a computation path for the first half and the sub-hologram segment of the second half and its offset position are included in a computation path for the second half of the sub-hologram, in which in each case the addition of the sub-hologram segments takes place in hologram row memories which are independent from one another,
aligning the sub-hologram segments according to the ascertained offset positions at the hologram row memory before the addition, and
combining the independent hologram row memories of the first and the second sub-hologram halves.

3 more elements

Dependencies are inferred from the claim text.

Device and method for calculating holographic data

Life of this patent

Device and method for calculating holographic data

Life of this patent

Abstract

Claims17