A Wide Spectrum Single Frame Scattering Imaging Method Based on Scattering Medium

Abstract

The invention discloses a wide-spectrum single-frame scattering imaging method based on a scattering medium. , a collimating lens, an iris, a scattering medium, and a detector; obtaining a broadband point spread function of the broadband imaging system; utilizing the broadband imaging system to obtain a broadband speckle image of an imaging target; The wide-spectrum point spread function and the wide-spectrum speckle image are subjected to cross-correlation wide-spectrum reconstruction to obtain a reconstructed image of the imaging target. The wide-spectrum single-frame scattering imaging method only needs a single-frame wide-spectrum speckle combined with a pre-calibrated wide-spectrum light source point spread function, and the reconstructed target has high precision, fast speed, and simple optical path.

Description

technical field [0001] The invention belongs to the technical field of optical imaging, and in particular relates to a wide-spectrum single-frame scattering imaging method based on a scattering medium. Background technique [0002] When light waves are transmitted through the scattering medium or interact with its surface, different degrees of scattering will occur. Traditional optical imaging systems can only receive the speckle formed by the interference of scattered light, and cannot directly obtain the target information hidden behind the scattering medium. Currently, commonly used imaging methods through scattering media include speckle correlation imaging, transfer matrix light field imaging, and wavefront modulation imaging. Speckle correlation imaging technology can achieve small target imaging through scattering media through the high similarity of target autocorrelation and speckle autocorrelation combined with phase recovery technology, but its imaging is limited ...

AI Technical Summary

Problems solved by technology

The above method solves the imaging requirement through the scattering medium to a certain extent, but its imaging spectral width is limited to laser light source or narrow-band LED light source, usually the spectral width does not exceed 20nm

[0004] In 2017, according to the spectral decorrelation characteristics of the scattering medium, Sujit Kumar Sahoo et al. of Nanyang Technological University in Singapore realized the single-frame black and white camera through the scattering medium by measuring the point spread function of the scattering medium in different narrow spectral ranges, combined with deconvolution technology multispectral imaging, but it needs to introduce different narrow-spectrum filters in the optical path, and the experimental optical path is more complicated

In 2018, Xu Xiaoqing and others from Sun Yat-sen University used the scaling characteristics of the point spread function of the scattering medium at different wavelengths, combined with the prior target information, to realize the reconstruction of the unknown spectral target through the scattering medium. This method needs to introduce a reference target. And the reconstruction effect is not ideal

In 2019, Joel A.Greenberg and others from Duke University in the United States used spectral coding combined with compressed sensing technology to achieve single-frame multi-spectral scattering imaging through scattering media, but the optical path needs to introduce spatial light modulators and spectroscopic elements. , the difficulty of the experiment is greatly increased, and it is necessary to introduce narrow-spectrum filters with different spectral widths

Introducing the target prior reference or adopting the method of dividing and conquering the filter is inconvenient to operate and the system is complicated. Although the problem can be solved to a certain extent, it also limits the application and promotion of this type of technology in practice.

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