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A Space-Time Multiplexing Method for Suppressing Speckle Noise in Computational Holographic Display

A speckle noise and computational holography technology, applied in the field of holographic display, can solve the problem of difficult to use spatial light modulator holographic display, and achieve the effect of complete viewing, suppression of generation, and suppression of speckle noise

Active Publication Date: 2019-06-28
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The pixel separation method also needs to calculate multiple holograms, and it is difficult to use the spatial light modulator to realize real-time dynamic holographic display

Method used

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  • A Space-Time Multiplexing Method for Suppressing Speckle Noise in Computational Holographic Display
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  • A Space-Time Multiplexing Method for Suppressing Speckle Noise in Computational Holographic Display

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Embodiment Construction

[0023] In the following, a typical embodiment of the spatiotemporal multiplexing method for suppressing the speckle noise of the computed holographic display of the present invention will be described in detail, and the present invention will be further described in detail.

[0024] The synthetic graph generation method of the present invention includes the following steps:

[0025] Step 1: Determine the wavelength of the reproduced light at 532nm, the aperture of the spatial light modulator at 15.36mm, the reproduction distance of 500mm, and the radius of the Airy spot .

[0026] Step 2: Obtain the horizontal resolution of 1920, the vertical resolution of 1080, the horizontal pixel interval of 8μm, the vertical pixel interval of 8μm, and the horizontal sampling interval of the Airy spot And vertical pixel spacing , According to the sampling interval of Airy spots and the radius of Airy spots, the number of pixels separated in the recorded scene ,ceil() represents the rounding up ...

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Abstract

The invention proposes a space-time multiplexing method for suppressing computer-generated holographic display speckle noise. According to the method, a plurality of computer-generated holograms are generated by a pixel separation method, and the reproduction of the computer-generated holograms is performed by the space-time multiplexing method according to light polarization state characteristic and visual persistence characteristic of a human eye. The computer-generated holograms is reproduced according to groups, the computer-generated holograms in the same group employ reproduced light with different polarization states, the suppression of speckle nose of Airy disc image points which are stacked is achieved by space multiplexing of a plurality of space light modulators, for the computer-generated holograms in different groups, the Airy disc image points are prevented from being stacked in space by a time multiplexing method, and the generation of the speckle noise is further prevented; and meanwhile, by a visual persistence effect of the human eye, the complete viewing of recording information is achieved.

Description

Technical field [0001] The present invention relates to the field of holographic display, in particular to a spatiotemporal multiplexing method for suppressing speckle noise of computed holographic display. Background technique [0002] The holographic display can not only restore the amplitude information of the recorded scene, but also restore the phase information representing the relative position of the object in the scene, providing the viewer with the same visual experience as watching the real scene. It is called the most ideal stereoscopic display method . Among them, computational holography has become one of the research hotspots in display technology due to its unique flexibility and high efficiency. However, due to the demand for high coherence of the reconstructed light by the CGH display, when the diffracted light forms the required reconstructed image on the receiving screen, it will also generate randomly distributed speckle noise, which seriously reduces the qu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03H1/26
CPCG03H1/26G03H1/2645G03H2001/2605G03H2001/2655
Inventor 王琼华刘素娟肖聃
Owner SICHUAN UNIV
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