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A Hologram Coding Method for Precise Intensity Modulation Holographic Display

An intensity modulation and holographic display technology, which is applied in image coding, image data processing, instruments, etc., can solve the problems of high computing system requirements, information loss, and inability to realize image display, etc., achieve high display quality, meet real-time performance, Avoid Computing the Effect of Speckle Noise

Active Publication Date: 2017-06-16
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process is time-consuming and has high requirements on the computing system: only a fast computing process can satisfy the real-time performance of the display
Not only that, when the hologram obtained by these methods is displayed, it still cannot achieve accurate image display, and there is computational speckle noise in the image
The reason for this problem is that during the calculation, random phase factors (usually using a completely random distribution) are used, which have infinite bandwidth distribution; but when calculating the frequency domain part, only limited bandwidth can be sampled and calculated, thus causing Information is lost, noise is introduced
Although this problem can be compensated by using a pseudo-random phase distribution, it will increase the calculation time

Method used

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  • A Hologram Coding Method for Precise Intensity Modulation Holographic Display
  • A Hologram Coding Method for Precise Intensity Modulation Holographic Display
  • A Hologram Coding Method for Precise Intensity Modulation Holographic Display

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Embodiment 1

[0038] Embodiment 1: as figure 1 As shown, this embodiment provides a hologram encoding method for precise intensity modulation holographic display, including the following steps:

[0039] Step 1: Determine the amplitude distribution of the optical wave field of the target image.

[0040] The target image is the light field intensity distribution in the final imaging, which is the square of the amplitude. The human eye is only sensitive to this information when viewing, but not to the phase in the complex amplitude light field of the light wave; the phase distribution of the light wave field is not specified only by the target image information. Therefore, we ignore the phase information of the optical wavefield and only keep the amplitude distribution.

[0041] Step two:

[0042]Compute the phase distribution over each pixel in the first column of two phase-only holograms:

[0043] Among them, the phase distribution on each pixel of the first column of the first hologram ...

Embodiment 2

[0058] Embodiment 2: as figure 2 As shown, on the basis of the hologram encoding method for precise intensity modulation holographic display provided in Embodiment 1, this implementation provides a three-dimensional holographic display method based on grating precise intensity modulation, including the following steps:

[0059] Step 1: Build a dual spatial light modulator precise modulation system based on grating frequency domain addition, number one of the spatial light modulators as the first spatial light modulator 10, and the other as the second spatial light modulator 11;

[0060] The first spatial light modulator 10 and the second spatial light modulator 11 are located on the same plane;

[0061] Step 2: Use a coherent light source or a partially coherent light source to expand and collimate the beam to generate parallel light, and irradiate the precise modulation system of dual spatial light modulators based on grating frequency domain addition; the light waves modula...

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Abstract

The invention relates to a hologram coding method of precise intensity modulation holographic display. Light intensity of a target image is accurately coded into two pure phase holograms by means of an interference principle, speckle noise calculation is prevented by a simple and analytic recursive algorithm, high display quality is provided due to precise light intensity coding, meanwhile, and real-time performance of a display system can be satisfied with the adoption of high-speed coding. The hologram coding method can be widely applied to dynamic holographic three-dimensional display field.

Description

technical field [0001] The invention relates to a dynamic holographic three-dimensional display method, in particular to a hologram encoding method for precise intensity modulation holographic display. Background technique [0002] The spatial light modulator is a device loaded with a hologram for three-dimensional object reconstruction, and is the core device for dynamic holographic three-dimensional display. Therefore, the level of the spatial light modulator device determines the reproduction effect. The reproduction effect includes the reproduction image size, resolution and field of view, etc. . However, existing spatial light modulators cannot meet the spatial bandwidth product requirements required for dynamic holographic 3D displays. LCoS is a relatively common spatial light modulator in the research of dynamic holographic three-dimensional display at present, especially the pure phase LCoS modulation device has the characteristics of high diffraction efficiency and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03H1/08G06T9/00
Inventor 刘娟李昕王涌天
Owner BEIJING INSTITUTE OF TECHNOLOGYGY