Imaging of Scattering Media Based on Phase Diversity Using Spatial Light Modulators

A technology of spatial light modulator and phase diversity, which is applied in the direction of instruments, optics, optical components, etc., can solve the problems of poor reconstruction effect and speckle diffusion error, and achieve the effect of reducing the amount of calculation and achieving good results

Active Publication Date: 2021-10-26
SICHUAN UNIV
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Problems solved by technology

However, this method also has obvious shortcomings. For example, moving the camera longitudinally can achieve the purpose of changing the aperture function of the imaging system, but it will also introduce new problems, namely the error caused by speckle diffusion.
This leads to the fact that for the obtained multi-frame speckle pattern, only the sub-speckle pattern can be intercepted in its central part to reconstruct the target object, and the reconstruction effect is not good

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  • Imaging of Scattering Media Based on Phase Diversity Using Spatial Light Modulators
  • Imaging of Scattering Media Based on Phase Diversity Using Spatial Light Modulators
  • Imaging of Scattering Media Based on Phase Diversity Using Spatial Light Modulators

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Embodiment Construction

[0048] The present invention will be further described below in conjunction with the accompanying drawings, and a specific embodiment of the present invention will be described.

[0049] In this example, the experimental device of the imaging system is as follows: figure 1 As shown, use a 80*80 pixel image (letter Z) as the target image, see figure 2 ; The whole process is simulated in MATLAB2016a environment.

[0050] The steps of the whole numerical simulation process are as follows:

[0051] (a) will figure 2 Enter the experimental environment simulated by MATLAB, change the phase control matrix of the spatial light modulator several times, and obtain 20 frames of speckle patterns (2400*2400 pixels), image 3 is one frame of the speckle image;

[0052] (b) Intercept the sub-speckle image at position 1 of the white box on the obtained 20-frame speckle image, and use Hanning window spatial filtering on the sub-speckle image, as shown in Figure 4 shown; then, similarly...

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Abstract

The invention proposes a scattering medium imaging method based on phase diversity by using a spatial light modulator, which belongs to the field of scattering medium imaging. The aperture function of the imaging system is changed by modulating the spatial light modulator, and the corresponding speckle pattern and the change of the aperture function are recorded for each change, and then the recorded multi-frame speckle pattern is reconstructed using the maximum likelihood estimation method and the quasi-Newton algorithm Image of a target behind a scattering medium. Compared with the previous scattering medium imaging method based on phase diversity, the present invention does not achieve the purpose of modulating the aperture function of the system by moving the camera position, so there will be no speckle diffusion problem caused by camera position changes; and it can be used in multiple Randomly select the same position on the frame speckle map to intercept the sub-speckle map, and the effect of reconstructing the target image is also better.

Description

technical field [0001] The invention belongs to the field of scattering medium imaging, in particular to a method for realizing scattering medium imaging based on phase diversity by using a spatial light modulator. Background technique [0002] Traditional optical imaging methods usually cannot directly obtain images of objects hidden behind scattering media. Therefore, how to use optical technology to image objects behind scattering media has been an important research topic in the field of optical imaging technology for a long time. With the deepening of the research, many experimental schemes have been proposed successively, such as the classic ghost imaging method, speckle correlation method, wavefront correction method and so on. Although these methods can get better results under certain conditions, they all have their own limitations, and these methods focus on how to successfully reconstruct the object image, while ignoring the point spread function of the imaging sy...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/48
CPCG02B27/48
Inventor 周昕王晶王金超白星
Owner SICHUAN UNIV
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