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A method for suppressing ringing in lensless holographic projection

A holographic projection, lensless technology, applied in the direction of the instrument, to achieve the effect of improving quality and eliminating ringing

Active Publication Date: 2019-06-25
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the problem of the ringing phenomenon in the reproduced image of the above-mentioned lensless holographic projection, and proposes a method for suppressing the ringing phenomenon in the lensless holographic projection

Method used

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  • A method for suppressing ringing in lensless holographic projection
  • A method for suppressing ringing in lensless holographic projection
  • A method for suppressing ringing in lensless holographic projection

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Embodiment Construction

[0014] A typical embodiment of a method for suppressing the ringing phenomenon in a lensless holographic projection of the present invention is described in detail below, and the method is further described in detail. It is necessary to point out that the following examples are only used for further explanation of the method, and cannot be understood as a limitation of the protection scope of the method. Those skilled in the art have made some non-essential methods for the method based on the content of the method described above. The improvements and adjustments still belong to the protection scope of the present invention.

[0015] The method for eliminating the ringing phenomenon in the reconstructed image of the lensless holographic projection is specifically described as follows:

[0016] Step 1: To the amplitude A(x 2 ,y 2 ) Times the convergence light w(x 2 ,y 2 ), the complex amplitude of the result is expressed as u 2 (x 2 ,y 2 )=A(x 2 ,y 2 )·W(x 2 ,y 2 ), where the conver...

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Abstract

The invention provides a method for suppressing ringing in a lensless holographic projection. By reducing a distance between a holographic surface and a focal plane of the convergent light, the methodbreaks the limitation of a distance relation between the diffraction distance and the focusing distance of the convergence light and the distance relation between the focal plane of the convergent light and the holographic surface in the conventional algorithm, can record more complete diffraction field on the holographic surface without losing high frequency information, and can reduce the effect of the transfer function on the reproduced image, thereby achieving the elimination of ringing. The method does not increase the complexity of the whole system, can eliminate the ringing phenomenonthat occurs when the lensless holographic projection is reproduced, and can improve the quality of the reproduced image, and has wide practicality in the field of micro-projection.

Description

Technical field [0001] The invention relates to the field of holographic display and holographic projection, in particular to a method for improving the quality of reproduced images in holographic projection. Background technique [0002] Lensless holographic projection technology is a hot field of holographic display in recent years. Its simplified system size and simple projection method make it possible to become a new generation of projection technology. Lensless holographic projection was first developed from the variable sampling rate Fresnel diffraction formula proposed by Richard P. Muffoletto in 2007. This projection method can realize the reduction and enlargement of the projected image without using a lens. The projection method reduces the complexity of the optical system, so that the projection system can be integrated into a smaller device, so it has a strong wide range of practicality. However, the ringing phenomenon in the reconstructed image of the lensless holo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03H1/22
CPCG03H1/22G03H1/2249
Inventor 王君陈纯刘婵娟
Owner SICHUAN UNIV
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