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Fourier power spectrum detection-based single-pixel phase imaging method

An imaging method and a single-pixel technology are applied in the direction of image detector methods, image signal processing, measuring devices, and material analysis through optical means, which can solve problems such as narrowing of the field of view and small magnification of observed objects, and achieve Improve sampling efficiency, good restoration effect, and reduce the effect of sampling time

Pending Publication Date: 2019-01-15
NANKAI UNIV
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Problems solved by technology

Common optical imaging platforms are limited by the space bandwidth product, that is, if we observe a wider field of view, the magnification of the observed object will be small; on the contrary, if we observe a larger magnification of the object, then the range of the field of view will shrink

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  • Fourier power spectrum detection-based single-pixel phase imaging method
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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings.

[0023] figure 2 The theoretical simulation results carried out according to the imaging architecture are given. In some embodiments, a 64×64 LED array is used as an illumination source, and includes the following steps:

[0024] 1) Place an oblique triangular asymmetric mask in front of the sample, and use the central light source to illuminate the mask without the sample, then the image of the mask can be obtained;

[0025] 2) Pre-write the random Hadamard matrix A, code the LED lighting sample, input each row of the measurement matrix into the LED unit through the single-chip microcomputer in sequence, and use a single photomultiplier tube to measure the single-pixel signal on the spectrum plane of the Fourier lens. get the signal sequence b;

[0026] The light emitted by a single LED is approximately considered as a plane wave, and its wave vector:

[0027] k i...

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Abstract

The invention discloses a Fourier power spectrum detection-based single-pixel phase imaging method, and belongs to the field of phase imaging. The Fourier power spectrum detection-based single-pixel phase imaging method comprises the steps of employing a part of random Hadamard matrixes as measurement matrixes; employing an LED array (1) to irradiate, inputting the Hadamard matrixes, controlling alight-emitting sequence of array points of the Hadamard matrixes; forming a frequency spectrum surface (5) by an optical Fourier lens (4), measuring a central composite power signal by a single optical signal detector (6), and eliminating double image noise by employing a non-symmetric mask; and recovering phase information of a sample by employing frequency domain compression sensing reconstruction algorithm and a phase recovering algorithm. Fourier ptychography theory is used as a foundation, the compression sensing theory is employed as a method for reducing sampling data size, sampling can be performed at a low sampling rate, the data size is remarkably reduced, favorable phase information is obtained, and no halo effect is generated.

Description

technical field [0001] The invention relates to the field of phase imaging, in particular to a single-pixel phase imaging method based on Fourier power spectrum detection. Background technique [0002] Phase imaging technology has important applications in biology and crystallography. This technology refers to a series of physical methods to obtain phase information of target objects. In the field of bioimaging, it is often used to obtain structural information of unstained samples. In the field of crystallography, it is often used in X-ray detection of metal cracks, hard X-ray detection and other directions. At present, the phase contrast method proposed by Zernike in 1935 is widely used. Although there are a lot of improvements, the following problems still remain unsolved: [0003] 1) The phase-contrast imaging method proposed by Zernike still has problems such as halo effect and shade-off effect, and the observation effect of the sample is not good enough, and the cur...

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Application Information

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IPC IPC(8): G01N21/17
CPCG01N21/17G01N21/1717G01N2021/1765G01N2021/1725
Inventor 周文远史秋帅惠王伟田建国
Owner NANKAI UNIV
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