Single-pixel imaging system based on co-modulation of scattering medium and spatial light modulator

Abstract

The invention discloses a single-pixel imaging system based on the co-modulation of a scattering medium and a spatial light modulator, comprising: a laser, a beam expander, a spatial light modulator, a fog chamber, a beam splitting prism, a CCD camera, a photomultiplier tube and an imaging module; a laser Used to emit laser light; beam expander is used to expand the laser beam; spatial light modulator is used to modulate the expanded laser beam with the modulation pattern of the pre-injected Hadamard matrix; fog chamber is used to modulate the beam after the spatial light modulator. The laser is again modulated by the scattering medium; the beam splitting prism is used to divide the light field modulated by the spatial light modulator and the water mist into two optical paths; the CCD camera is used to capture the modulated pattern through one optical path; the photomultiplier tube is used for It is used to collect the light intensity signal after the target is illuminated by another optical path; the imaging module is used to convert the light intensity information collected by the photomultiplier tube into a voltage signal, combined with the modulation pattern captured by the CCD camera, and reconstruct the target image through the compressed sensing algorithm.

Description

technical field [0001] The present invention relates to optical imaging, in particular to a single-pixel imaging system based on co-modulation of a scattering medium and a spatial light modulator. Background technique [0002] Imaging through time-varying scattering media is a difficult problem to overcome in many important fields. For example, military earth observation, autonomous driving in smog, turbid underwater imaging, etc. In a transparent medium, light travels along a straight line, so the carried target information is not destroyed, and clear imaging can be performed directly. However, when the light passes through the turbid scattering medium, the light no longer travels in a straight line, but randomly follows the scattering path, which will cause the image quality to deteriorate, and even when the scattering is severe, the image cannot be obtained at all. [0003] Because of the important application of imaging through scattering media, it has become a researc...

AI Technical Summary

Problems solved by technology

However, the limitation of this type of method is the excessive dependence on the training set, and the physical mechanism cannot be explained.

To sum up, there is no very effective solution to the problem of optical imaging of time-varying strongly scattering media.

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