Method and apparatus for processing holographic image

Patent metadata

Field	Value
Publication number	US-11320784-B2
Application number	US-201916717348-A
Country	US
Kind code	B2
Filing date	Dec 17, 2019
Priority date	Jul 3, 2019
Publication date	May 3, 2022
Grant date	May 3, 2022

Abstract

Provided are methods of processing a holographic image and apparatuses using the methods. A method includes obtaining image data with respect to a three-dimensional (3D) object, obtaining interference patterns in a computer-generated hologram (CGH) plane by performing a Fourier transform on the image data, and generating a CGH with respect to the 3D object based on the interference patterns, wherein the Fourier transform is performed based on a focal length of an eye lens of an observer.

First claim

What is claimed is:

1. A method of processing a holographic image, the method comprising:
obtaining image data with respect to a three-dimensional (3D) object;
obtaining interference patterns in a computer-generated hologram (CGH) plane by performing a Fourier transform on the image data;
generating a CGH with respect to the 3D object based on the interference patterns;
storing vision information of at least one user in a memory; and
reading vision information of a user matching vision information of an observer from the stored vision information of the at least one user,
wherein the Fourier transform is performed based on a focal length of an eye lens of the observer.

2. The method of claim 1 , wherein the Fourier transform comprises a primary Fourier transform for calculating propagation of light waves from a retinal plane to an eye lens plane of the observer, and a secondary Fourier transform for calculating the propagation of light waves from the eye lens plane to the CGH plane based on the focal length of the eye lens of the observer.

3. The method of claim 1 , wherein the vision information of the at least one user comprises at least one of a focal length of an eye lens of the at least one user, a refractive power of a lens for correction of the at least one user, a vision of the at least one user, a distance from a retinal plane to an eye lens plane of the at least one user, and a radius of a pupil of the at least one user.

4. The method of claim 3 , wherein the Fourier transform is performed based on a distance from a retinal plane to an eye lens plane of the observer and the focal length of the eye lens of the observer.

5. The method of claim 1 , further comprising:
obtaining a distance between the eye lens of the observer and a CGH plane,
wherein the Fourier transform is performed based on the distance between the eye lens of the observer and the CGH plane.

6. The method of claim 1 , further comprising:
reconstructing holographic images for each of an increased focal length and a decreased focal length by performing a Fourier transform while increasing or decreasing a focal length of an eye lens; and
receiving a command for selecting one of the reconstructed holographic images,
wherein the Fourier transform is performed based on the increased focal length or the decreased focal length corresponding to the selected reconstructed holographic image.

7. The method of claim 1 , further comprising:
reconstructing holographic images based on an increase or a decrease in at least one of a focal length and a distance from a retinal plane to an eye lens plane by performing a Fourier transform while increasing or decreasing the at least one of the focal length and the distance from the retinal plane to the eye lens plane; and
receiving a command for selecting one of the reconstructed holographic images,
wherein the Fourier transform is performed based on the increased at least one of the focal length and the distance from the retinal plane to the eye lens plane or the decreased at least one of the focal length and the distance from the retinal plane to the eye lens plane corresponding to the selected reconstructed holographic image.

8. The method of claim 1 , further comprising:
reconstructing holographic images for each increased or decreased distance between the eye lens of the observer and a CGH plane after performing the Fourier transform while increasing or decreasing the distance between the eye lens of the observer and the CGH plane; and
receiving a command for selecting one of the reconstructed holographic images,
wherein the Fourier transform is performed based on the increased distance between the eye lens of the observer or the decreased distance between the eye lens of the observer and a CGH plane corresponding to the selected reconstructed holographic image.

9. A computer-readable recording medium on which a program for executing a method of processing a holographic image on a computer is recorded, the method comprising:
obtaining image data with respect to a three-dimensional (3D) object;
obtaining interference patterns in a computer-generated hologram (CGH) plane by performing a Fourier transform on the image data;
generating a CGH with respect to the 3D object based on the interference patterns;
reconstructing holographic images for each of an increased focal length and a decreased focal length by performing a Fourier transform while increasing or decreasing a focal length of an eye lens; and
receiving a command for selecting one of the reconstructed holographic images,
wherein the Fourier transform is performed based on a focal length of an eye lens of an observer, and
wherein the Fourier transform is performed based on the increased focal length or the decreased focal length corresponding to the selected reconstructed holographic image.

10. An apparatus for processing a holographic image, the apparatus comprising:
a memory configured to store at least one program and store vision information of at least one user; and
a processor configured to process a holographic image by executing the at least one program,
wherein the processor is configured to:
obtain image data with respect to a three-dimensional (3D) object,
obtain interference patterns in a computer-generated hologram (CGH) plane by performing a Fourier transform on the image data, and
generate a CGH with respect to the 3D object based on the interference patterns,

wherein the Fourier transform is performed based on a focal length of an eye lens of an observer, and
wherein the processor is further configured to read vision information of a user matching the observer among the stored vision information of the at least one user stored in the memory.

11. The apparatus for processing a holographic image of claim 10 , wherein the Fourier transform comprises a primary Fourier transform for calculating propagation of light waves from a retinal plane to an eye lens plane of the observer, and a secondary Fourier transform for calculating the propagation of light waves from the eye lens plane to the CGH plane by reflecting the focal length of the eye lens of the observer.

12. The apparatus for processing a holographic image of claim 10 , wherein the vision information of the at least one user comprises at least one of a focal length of an eye lens of the at least one user, a refractive power of a lens for correction of the at least one user, a vision of the at least one user, a distance from a retinal plane to an eye lens plane of the at least one user, and a radius of a pupil of the at least one user.

13. The apparatus for processing a holographic image of claim 12 , wherein the Fourier transform is performed based on a distance from a retinal plane to an eye lens plane of the observer and a focal length of the eye lens of the observer.

14. The apparatus for processing a holographic image of claim 10 , wherein the processor is further configured to obtain a distance between the eye lens of the observer and a CGH plane, and
wherein the Fourier transform is performed based on the distance between the eye lens of the observer and the CGH plane.

15. The apparatus for processing a holographic image of claim 10 , further comprising:
a display panel configured to display the generated CGH; and
a user interface configured to receive a command of the observer.

16. The apparatus for processing a holographic image of claim 15 , wherein the display panel is further configured to display a CGH generated by Fourier transform performed while increasing and decreasing the focal length of the eye lens

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kim Young
• Seo Wontaek
• An Jungkwuen
• Won Kanghee
• Lee Hongseok
• Song Hoon
• Choi Chilsung

Classifications

• G03H2001/0441

  Formation of interference pattern, not otherwise provided for · CPC title

• G03H2210/441

  Numerical processing applied to the object data other than numerical propagation · CPC title

• G03H2001/0816

  Iterative algorithms · CPC title

• G03H2001/221

  Element having optical power, e.g. field lens · CPC title

• G03H1/0808 Primary

  Methods of numerical synthesis, e.g. coherent ray tracing [CRT], diffraction specific · CPC title