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

Abstract

The invention discloses a single-pixel imaging system based on common modulation of a scattering medium and a spatial light modulator. The system comprises a laser, a beam expander, the spatial light modulator, a fog chamber, a beam splitter prism, a CCD camera, a photomultiplier and an imaging module. The laser is used for emitting laser; the beam expander is used for expanding the laser; the spatial light modulator is used for modulating the expanded laser by using the modulation pattern of the pre-injected Hadamard matrix; the fog chamber is used for carrying out primary scattering medium modulation on the laser modulated by the spatial light modulator; the beam splitter prism is used for dividing a light field which is jointly modulated by the spatial light modulator and the water mist into two light paths; the CCD camera is used for shooting a modulated pattern through a light path; the photomultiplier is used for collecting a light intensity signal after the other light path irradiates the target; and the imaging module is used for converting light intensity information collected by the photomultiplier into a voltage signal, and reconstructing a target image through a compressed sensing algorithm in combination with a modulation pattern shot by the CCD camera.

Description

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

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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