Method and apparatus for processing hologram image data

Patent metadata

Field	Value
Publication number	US-11156961-B2
Application number	US-201916361422-A
Country	US
Kind code	B2
Filing date	Mar 22, 2019
Priority date	Sep 27, 2018
Publication date	Oct 26, 2021
Grant date	Oct 26, 2021

Abstract

A method and apparatus for processing hologram image data capable of optimizing image quality of a hologram image are provided. The image processing method includes receiving input image data, reading a header included at a predetermined location in the input image data, and generating hologram data configured to display a hologram image by performing a Fourier calculation and pixel encoding on the input image data based on at least one parameter recorded in the header, wherein the at least one parameter recorded in the header includes at least one of depth information, scale information, and gamma information.

First claim

What is claimed is:

1. An image processing method comprising:
receiving input image data comprising color image data and depth image data;
reading a header included at a region of the color image data or a region of the depth image data included in the input image data; and
generating hologram data configured to display a hologram image by performing a Fourier calculation and pixel encoding on the input image data based on at least one parameter recorded in the header,
wherein the at least one parameter recorded in the header comprises at least one of depth information, scale information, and gamma information.

2. The image processing method of claim 1 ,
wherein the header further comprises an identification code, and
wherein the reading of the header comprises:
reading the identification code included in the header;
determining whether the identification code recorded in the header is equal to a predetermined identification code; and
storing the at least one parameter recorded in the header in a memory when the identification code recorded in the header is equal to the predetermined identification code or storing a predetermined default parameter in the memory when the identification code recorded in the header is not equal to the predetermined identification code.

3. The image processing method of claim 1 , wherein the generating the hologram data comprises:
performing a first Fourier calculation based on a distance between an observer's pupil and a retina;
performing a focus term calculation and a depth addition using the depth information; and
performing a second Fourier calculation based on a distance between a display panel configured to display the hologram image and the observer's pupil.

4. The image processing method of claim 3 , wherein the depth information comprises location information of a plurality of depth layers of the hologram image.

5. The image processing method of claim 4 , wherein the depth information comprises values of a plurality of focus terms corresponding to a location of the plurality of depth layers of the hologram image.

6. The image processing method of claim 4 , wherein a plurality of combinations of focus terms corresponding to a plurality of location combinations with respect to the plurality of depth layers are predefined, and
wherein the depth information corresponds to any one of the plurality of combinations of the focus terms.

7. The image processing method of claim 3 , wherein the generating of the hologram data further comprises performing scaling transformation on a first complex image having a first resolution generated by the second Fourier calculation to a second complex image having a second resolution higher than the first resolution,
wherein scaling transformation is performed based on the scale information.

8. The image processing method of claim 7 ,
wherein the generating of the hologram data further comprises performing pixel encoding on complex values of a second complex image having the second resolution to integer values, and
wherein the performing of the pixel encoding comprises adjusting a brightness of the hologram image based on the gamma information.

9. The image processing method of claim 1 , wherein the input image data comprises a plurality of frames respectively comprising a header, and
wherein parameters recorded in headers of the plurality of frames are different from each other.

10. A non-transitory computer-readable recording medium having recorded thereon a computer program which, on a computer, performs the image processing method of claim 1 .

11. The image processing method of claim 1 , wherein the depth information comprises variable location information of a plurality of depth layers of the hologram image to adapt locations of the plurality of depth layers in accordance with occupancy by a main object of interest in the holographic image, and
the image processing method further comprises dynamically changing the locations of the plurality of depth layers of the reproduced holographic image based on the variable location information.

12. An image processing apparatus comprising:
a processor configured to read a header included at a region of a color image data or a region of a depth image data included in input image data and generate hologram data configured to display a hologram image by performing a Fourier calculation and pixel encoding based on at least one parameter recorded in the header; and
a memory,
wherein the at least one parameter recorded in the header comprises at least one of depth information, scale information, and gamma information.

13. The image processing apparatus of claim 12 ,
wherein the header comprises an identification code, and
wherein the processor is further configured to determine whether the identification code included in the header is equal to a predetermined identification code, and store the at least one parameter recorded in the header in the memory when the identification code recorded in the header is equal to the predetermined identification code or store a predetermined default parameter in the memory when the identification code recorded in the header is not equal to the predetermined identification code.

14. The image processing apparatus of claim 12 , wherein the processor is further configured to:
perform a first Fourier calculation based on a distance between an observer's pupil and a retina;
perform a focus term calculation and a depth addition based on the depth information; and
perform a second Fourier calculation based on a distance between a display panel configured to display the hologram image and the observer's pupil.

15. The image processing apparatus of claim 14 , wherein the depth information comprises location information of a plurality of depth layers of the hologram image.

16. The image processing apparatus of claim 15 , wherein the depth information comprises values of a plurality of focus terms each corresponding to a location of the plurality of depth layers of the hologram image.

17. The image processing apparatus of claim 15 , wherein a plurality of combinations of focus terms corresponding to a plurality of location combinations with respect to the plurality of depth layers are predefined, and
wherein the depth information corresponds to any one of the plurality of combinations of the focus terms.

18. The image processing apparatus of claim 14 , wherein the processor is further configured to perform scaling transformation on a first complex image having a first resolution generated by the second Fourier calculation to a second complex image having a second resolution higher than the first resolution, based on the scale information.

19. The image processing apparatus of claim 18 , wherein the processor is further configured to encode complex values of a second complex image having the second resolution to integer values, and adjust a brightness of the hologram image based on the gamma information.

20. The image processing apparatus of claim 12 , further comprising:
a camera configured to capture an image and obtain image data,
wherein the camera is further configured to insert a header having a predetermined parameter value for a mode selected by a user into the image data or automatically determine a parameter value and insert the header having the determined parameter value into the image data.

21. The image processing apparatus of claim 12 , wherein the depth information comprises variable location information of a

Assignees

• Samsung Electronics Co Ltd
• Univ Seoul Ind Coop Found

Inventors

• Kim Hojung
• Kim Kichul
• Kim Yongkyu
• Lee Hongseok

Classifications

• G03H1/0486 Primary

  Improving or monitoring the quality of the record, e.g. by compensating distortions, aberrations · CPC title

• G03H2001/0204

  Object characteristics · CPC title

• G03H1/2249

  Holobject properties · CPC title

• G03H1/0406

  Image plane or focused image holograms, i.e. an image of the object or holobject is formed on, in or across the recording plane · CPC title

• G03H1/02 Primary

  Details {of features involved during the holographic process; Replication of holograms without interference recording} · CPC title