A method for generating phase-only holograms with improved reconstructed image quality
A hologram, pure phase technology, applied in the field of holographic projection display, can solve the problems of degradation of reproduced image quality, loss of amplitude or phase, etc., and achieve the effect of improving the quality of reproduced image
Active Publication Date: 2020-03-06
CHENGDU RONGAO TECH
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Problems solved by technology
However, the current holographic display technology still has some problems to be solved urgently, one of which is the quality degradation of the reconstructed image due to the loss of amplitude or phase
The reconstructed image quality of phase-only holograms can be improved to some extent by adding random phases to the object, however speckle noise caused by interference is also a problem to be solved
Method used
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[0014] A typical embodiment of a pure phase hologram generating method for improving the quality of reproduced images of the present invention will be described in detail below, and the present invention will be further described in detail. It is necessary to point out here that the following examples are only used for further explanation of the present invention and cannot be understood as limiting the scope of protection of the present invention. Those skilled in the art have made some non-essential improvements to the present invention based on the above-mentioned content of the present invention. And adjustments still belong to the protection scope of the present invention.
[0015] The specific implementation of the method of the present invention is as follows:
[0016] The generation process of pure phase hologram (such as figure 1 Shown) is divided into the following steps:
[0017] (I) Enlarge the sampling interval: keep the resolution unchanged for an image with a sampling...
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Aiming at the problem that the quality of a reproduced image is not high due to speckle noise and aliasing phenomena in the pure phase hologram generation process, the invention provides a pure phasehologram generation method capable of improving the quality of the reproduced image. According to the invention, through rasterized object sampling, the method makes the most of the aliasing phenomenon to enable the amplitude distribution on the holographic surface to be uniform, and the loss information of the generated pure phase hologram is reduced, so that the original object can be completelyreproduced, and the reproduced image quality of the pure phase hologram is effectively improved. The method is simple and good in effect, and has great application potential in current popular AR display and projection display.
Description
Technical field [0001] The invention relates to a holographic projection display field, in particular to a method for generating a pure phase hologram. Background technique [0002] Holographic display can provide all the information the observer needs, so it is recognized as the most promising 3D display technology. However, the current holographic display technology still has some problems to be solved urgently, one of which is the degradation of the quality of the reconstructed image due to the loss of amplitude or phase. The quality of the reconstructed image of pure phase hologram can be improved by adding random phase to the object, but speckle noise caused by interference is also a problem that needs to be solved. Another reason for the degradation of pure phase hologram's reproduction quality is aliasing. Usually aliasing needs to be eliminated. However, through research and analysis, it has been found that if aliasing is used properly, it can also be used to improve the...
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IPC IPC(8): G03H1/04
Inventor 不公告发明人
Owner CHENGDU RONGAO TECH