Image data processing method and apparatus

Patent metadata

Field	Value
Publication number	US-2018150027-A1
Application number	US-201715819656-A
Country	US
Kind code	A1
Filing date	Nov 21, 2017
Priority date	Nov 30, 2016
Publication date	May 31, 2018
Grant date	—

Abstract

A method of obtaining a focus term by using a periodicity of the focus term is provided. The focus term may be used in a plurality of operation processes for processing image data.

First claim

What is claimed is:

1 . An image data processing method comprising:
obtaining a coordinate value of a hologram image corresponding to a location of a pupil; obtaining a reference constant which corresponds to the obtained coordinate value; obtaining a focus term by updating a phase of the reference constant according to a section, from among a plurality of predetermined sections, comprising the obtained coordinate value; and obtaining image data by performing an operation using the focus term, and storing the image data.

2 . The method of claim 1 , wherein a period of the reference constant, according to a change in a square of a distance of the coordinate value from an origin, is shorter than a period of the focus term, according to the change in the square of the distance of the coordinate value from the origin.

3 . The method of claim 1 , further comprising displaying the hologram image by using the stored image data.

4 . The method of claim 1 ,
wherein the obtaining the image data comprises:
performing a first Fourier operation based on a distance between a display on which the hologram image is to be displayed and the pupil;
performing a second Fourier operation based on a distance between the pupil and retina, comprising using, as an input of the second Fourier operation, a result of the first Fourier operation and an operation of the focus term; and
obtaining a brightness value of the hologram image based on a result of the second Fourier operation; and
wherein the storing the image data comprises storing the brightness value of the hologram image.

5 . The method of claim 1 , wherein the section comprising the obtained coordinate value is a quadrant comprising the focus term, wherein the focus term corresponds to a square of a distance of the coordinate value from an origin on two-dimensional coordinates.

6 . The method of claim 1 , wherein the obtaining the reference constant comprises:
determining an address in which the reference constant is stored, according to the coordinate value; and obtaining the reference constant by loading data recorded on the address from a memory.

7 . The method of claim 6 , wherein a bitstream indicating the address comprises a plurality of bits indicating the section comprising the obtained coordinate value, and
the obtaining the reference constant by loading the data recorded on the address from the memory comprises obtaining the reference constant by using a bit not included in the bitstream.

8 . The method of claim 7 , wherein the plurality of bits indicating the address comprises high order 2 bits of the bitstream.

9 . The method of claim 1 , wherein the obtaining the focus term comprises updating the phase of the reference constant by a predetermined value.

10 . The method of claim 9 , wherein the predetermined value comprises at least one of 90°, 180°, and 270°.

11 . An image data processing apparatus comprising:
a memory configured to store image data and software, and a processor configured execute the software and thereby: obtain a coordinate value of a hologram image corresponding to a location of pupil, obtain a reference constant which is a constant corresponding to the obtained coordinate value, obtain a focus term by updating a phase of the reference constant according to a section, from among a plurality of predetermined sections, comprising the obtained coordinate value, and obtain the image data by performing an operation using the focus term.

12 . The apparatus of claim 11 , wherein a period of the reference constant, according to a change in a square of a distance of the coordinate value from an origin, is shorter than a period of the focus term according to the change in the square of the distance of the coordinate value from the origin.

13 . The apparatus of claim 11 , further comprising a display configured to display the hologram image using the stored image data.

14 . The apparatus of claim 11 , wherein the processor is further configured to:
perform a first Fourier operation based on a distance between a display on which the hologram image is to be displayed and the pupil, perform a second Fourier operation based on a distance between the pupil and retina, comprising, using as an input of the second Fourier operation, a result of the first Fourier operation and an operation of the focus term, and obtain a brightness value of the hologram image based on a result of the second Fourier operation.

15 . The apparatus of claim 11 , wherein the section comprising the obtained coordinate value is a quadrant comprising the focus term, wherein the focus term corresponds to a square of a distance of the coordinate value from an origin on two-dimensional coordinates.

16 . The apparatus of claim 11 , wherein the processor is further configured to determine an address in which the reference constant is stored, according to the coordinate value, and to obtain the reference constant by loading data recorded on the address from the memory.

17 . The apparatus of claim 16 , wherein a bitstream indicating the address comprises a plurality of bits indicating the section comprising the obtained coordinate value, and
the processor is further configured to obtain the reference constant by using a bit not included in the bitstream.

18 . The apparatus of claim 17 , wherein the plurality of bits indicating the address comprises high order 2 bits of the bitstream.

19 . The apparatus of claim 16 , wherein the memory is further configured to store a lookup table regarding data of the reference constant.

20 . A non-transitory computer-readable recording medium having recorded thereon a program for performing a method comprising:
obtaining a coordinate value of a hologram image corresponding to a location of a pupil; obtaining a reference constant which corresponds to the obtained coordinate value; obtaining a focus term by updating a phase of the reference constant according to a section, from among a plurality of predetermined sections, comprising the obtained coordinate value; and obtaining image data by performing an operation using the focus term; and storing the image data.

Assignees

• Samsung Electronics Co Ltd
• Univ Seoul Ind Coop Found

Inventors

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

Classifications

• G03H1/16

  using Fourier transform ({G03H1/10}, G03H1/12, G03H1/14 take precedence; analogue computers G06G, e.g. G06G7/19) · CPC title

• G03H1/0005 Primary

  Adaptation of holography to specific applications (holographic optical element G02B5/32; holographic scanner G02B26/106; recognition using holographic mask G06V10/88; holographic memories G11B7/0065, G11C13/042) · CPC title

• G03H2001/0088

  for video-holography, i.e. integrating hologram acquisition, transmission and display · CPC title

• G03H1/0866

  Digital holographic imaging, i.e. synthesizing holobjects from holograms · CPC title

• G03H2001/045

  Fourier or lensless Fourier arrangement · CPC title