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Penetrating scattering medium high-resolution imaging method based on Richardson-Lucy deconvolution

An imaging method and high-resolution technology, which is applied in the field of laser penetrating scattering medium imaging, can solve the problem of low image resolution and achieve the effect of improving lateral resolution

Pending Publication Date: 2021-06-29
HARBIN INST OF TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of low resolution of the output image of the ballistic imaging method based on time gating, and to provide a high-resolution imaging method for penetrating scattering media based on Richardson–Lucy deconvolution

Method used

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  • Penetrating scattering medium high-resolution imaging method based on Richardson-Lucy deconvolution
  • Penetrating scattering medium high-resolution imaging method based on Richardson-Lucy deconvolution
  • Penetrating scattering medium high-resolution imaging method based on Richardson-Lucy deconvolution

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specific Embodiment approach 1

[0034] Specific implementation mode one: the following combination Figure 1 to Figure 3 Describe this embodiment, the Richardson-Lucy deconvolution-based high-resolution imaging method for penetrating scattering media described in this embodiment, the method includes steps:

[0035] Step 1, using the APD array detector to collect the laser signal reflected by the target surface interfered by scattering;

[0036] Step 2, using the time gate to retain the ballistic photons and serpentine photons in the laser signal;

[0037] Step 3, using Richardson–Lucy deconvolution to estimate the photon time distribution without broadening for each channel;

[0038] Step 4. After iterative convergence, according to the photon time distribution estimated in step 3, the peak photon number on each channel is intercepted as the effective photon number of the channel;

[0039] Step 5: Reconstruct the ballistic light image according to the effective number of photons of each channel.

[0040] ...

specific Embodiment approach 2

[0050] Specific implementation mode two: the following combination figure 2 Describe this embodiment mode, this embodiment mode will further describe Embodiment 1, and also includes the following steps:

[0051] Step 6: Obtain the target image by superimposing the continuous multi-frame ballistic light images.

[0052] The last thing to deal with is background noise from instruments and ambient light. Due to the time-domain Gaussian statistical characteristics of the background noise brought by the instrument and ambient light, the increment of noise multi-frame superposition is much smaller than the increment of signal multi-frame superposition. The invention superimposes multiple frames of deconvolution-processed ballistic light images together, thereby increasing the contrast of the signal and reconstructing the target image hidden behind the scattering medium.

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Abstract

The invention discloses a penetrating scattering medium high-resolution imaging method based on Richardson-Lucy deconvolution, belongs to the technical field of laser penetrating scattering medium imaging, and aims to solve the problem that a ballistic imaging method based on time gating is low in output image resolution. The method comprises the steps of 1, acquiring a laser signal reflected by a target surface subjected to scattering interference by using an APD array detector; 2, keeping ballistic photons and snakelike photons in the laser signal by using a time gate; 3, estimating the time distribution of photons, which are not broadened, of each channel by adopting Richardson-Lucy deconvolution; 4, after iterative convergence, intercepting a photon number peak value on each channel as an effective photon number of the channel according to the photon time distribution estimated in the step 3; and 5, reconstructing a ballistic light image according to the number of effective photons of each channel.

Description

technical field [0001] The invention belongs to the technical field of laser penetrating scattering medium imaging. Background technique [0002] Imaging through scattering media is one of the basic problems of modern optics, and it is of great significance to the fields of science and technology, especially in biomedical imaging, underwater detection imaging, and imaging through clouds and fog. The basic principle of imaging through a scattering medium is that photons propagating in a scattering medium can be divided into ballistic photons without scattering, serpentine photons with less scattering interference, and diffuse photons. Since the imaging ballistic photons, serpentine photons and diffuse photons are separated, the time gate technology distinguishes them according to the time when photons arrive at the detector after passing through the scattering medium. Ballistic and serpentine photons arrive earlier, while diffuse photons arrive at It's late. After the time ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J1/44
CPCG01J1/44G01J2001/442G01J2001/4446
Inventor 张子静李家欢赵远孙怿飞
Owner HARBIN INST OF TECH
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