A method to reduce coherent noise of holographic reconstructed image calculated by n-lut method

A technology of computational holography and coherent noise, applied in the field of computational holography, can solve problems such as poor imaging quality and coherent noise, and achieve the effect of simple method, fast calculation speed, and easy implementation

Active Publication Date: 2018-11-09
ACADEMY OF ARMORED FORCES ENG PLA
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Problems solved by technology

Therefore, the obtained hologram has strong coherence, and serious coherent noise will appear when the hologram is reproduced, and the imaging quality is poor.

Method used

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  • A method to reduce coherent noise of holographic reconstructed image calculated by n-lut method
  • A method to reduce coherent noise of holographic reconstructed image calculated by n-lut method
  • A method to reduce coherent noise of holographic reconstructed image calculated by n-lut method

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[0025] The "method for reducing the coherent noise of the holographic reconstructed image calculated by the N-LUT method" of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0026] figure 1 It is the first embodiment of the method for reducing the coherent noise of the holographic reconstructed image calculated by the N-LUT method provided by the present invention. Including object point (1), object light wave (2), reference light wave (3), holographic surface (4), PFPs (5).

[0027] figure 1 The initial phase of the middle object point (1) is The number of is n, obey the standard normal distribution, that is, u=0, σ=1. for The probability density function of , then:

[0028]

[0029] figure 1 The middle object point (1) is located at x o the y o The origin of the plane, the holographic surface (4) is located at x h the y h plane, the distance between the object point (1) and the holograp...

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Abstract

The invention belongs to the field of hologram calculating, and particularly relates to a method for reducing reproductive image coherent noise of a hologram calculated in an N-LUT method. The method is characterized in that a three-dimensional object is divided into a series of two-dimensional image planes parallel with a hologram surface, an object point in the center of each two-dimensional image plane is provided with n different initial phases, coherent superposition is carried out on the n different initial phases and reference light, and n PFPs are generated. One PFP is selected randomly from the corresponding n PFPs of the two-dimensional image plane where a certain object point in the three-dimensional space is located and serves as a female PFP of the corresponding object point, and then a corresponding portion is cut off from the female PFP and then the hologram of the corresponding object point is formed. The holograms of the object points are obtained from the PFPs selected randomly, coherent noise caused when the same PFP is used for obtaining the holograms on the same object plane can be lowered, quality of a reproductive image is obviously improved and a high calculation speed of the N-LUT method is maintained.

Description

technical field [0001] The invention belongs to the field of computational holography, and in particular relates to a method for reducing the coherent noise of a reconstructed holographic image calculated by an N-LUT method. Background technique [0002] D. Gabor, a British physicist born in Hungary in 1947, proposed the idea of ​​holography. Holography means complete information, including not only the amplitude information of light, but also phase information. The amplitude represents the brightness of the object, and the phase reflects the depth of the object. The hologram simultaneously records the amplitude and phase information of the object light wave, so it can realize the three-dimensional display of the object. Holography includes two processes of wavefront recording and wavefront reconstruction. Wavefront recording is the interference between the object light wave and the reference light wave on the holographic recording medium, and the object light wavefront is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 蒋晓瑜闫兴鹏赵锴裴闯陈卓严志强
Owner ACADEMY OF ARMORED FORCES ENG PLA
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