Digital holography reconstruction method based on iterated denoising shrinkage-thresholding algorithm

An iterative denoising shrinkage and digital holography technology, applied in the field of digital holography, can solve the problems of slow convergence speed and low reconstruction accuracy

Inactive Publication Date: 2016-06-01
XI AN JIAOTONG UNIV
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Problems solved by technology

[0004] In the prior art, in the process of digital holographic image reconst

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  • Digital holography reconstruction method based on iterated denoising shrinkage-thresholding algorithm
  • Digital holography reconstruction method based on iterated denoising shrinkage-thresholding algorithm
  • Digital holography reconstruction method based on iterated denoising shrinkage-thresholding algorithm

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Embodiment Construction

[0093] A digital holographic reconstruction method based on iterative denoising shrinkage threshold algorithm, comprising the following steps:

[0094] Step 1: From the plane where the known object is located, the object light wave of the object itself is diffracted from this plane, and the plane is set as x 0 the y 0 plane, the amplitude O of the light field distribution of the object 0 (ξ, η) Using Fresnel diffraction, according to the principle of Huygens-Fresnel wavelet interference, the complex amplitude O(x,y) of the diffracted light at any point P(x,y) on the observation plane whose distance from the aperture plane is z is obtained ), and expand its quadratic phase factor to obtain the Fourier transform expression of Fresnel diffraction; read in the original image, its amplitude is O 0 (ξ, η), using the object light information of this original image to perform Fresnel diffraction to obtain the complex amplitude O(x, y) on the observation plane;

[0095] Step 2: Inte...

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Abstract

The invention discloses a digital holography reconstruction method based on an iterated denoising shrinkage-thresholding algorithm. The method comprises the following steps of 1, reading an original image, and acquiring diffraction light complex amplitude O(x, y) by using object light information of the original image, wherein the amplitude of the original image is O<0>(Xi, Eta); 2, intervening the diffraction light complex amplitude O(x, y) obtained through fresnel diffraction and reference light R(x, y) added with o and Pi second phase shift quantity to separately achieve light wave complex amplitude U<1>(x, y)/U<2>(x, y) on a holographic plate, laminating the two holographic images I<(1)> and I<(2)> to form a phase shift holographic image I-bar (x, y), constructing a sensing matrix A, and allowing y=Pi I-bar=Pi RO=AO, wherein Pi is a known measurement matrix, R is a spare basis matrix, and y expresses obtained observation data; and 4, figuring out and acquiring a reconstructed image of the original object by using the iterated denoising shrinkage-thresholding algorithm (IDNST). On the basis of TwIST algorithm, dual shrinkage of a threshold value and a regularization parameter are introduced to the IDNST algorithm, the signal-to-noise ratio can be improved, moreover, the convergence speed is increased, the reconstruction precision is improved, and the reproduction quality reaches a more excellent level.

Description

technical field [0001] The invention relates to the technical field of digital holography, in particular to a digital holographic reconstruction method based on an iterative denoising shrinkage threshold algorithm. Background technique [0002] Compared with traditional optical holography, compressed sensing technology has the following advantages when applied to digital holography: 1) Because electronic imaging devices are used to replace holographic dry plates to record holograms, the required exposure time can be very short, and Without the wet processing process of the chemical silver salt dry plate, it can continuously record the various instantaneous processes of moving objects, which is conducive to the realization of real-time online holographic recording; 2) the reproduction pattern obtained by digital calculation can be quantitatively analyzed by computer. The digitally reproduced hologram obtains the complex amplitude distribution of the object field, and the inte...

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Application Information

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IPC IPC(8): G03H1/08
CPCG03H1/0808G03H1/0866G03H2001/0816
Inventor 刘静白彩娟蒋晓瑜张国贤黄开宇
Owner XI AN JIAOTONG UNIV
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