Weak light image reconstruction device and method based on instability of liquid crystal modulation

Abstract

The invention provides a weak light image reconstruction device and method based on instability of liquid crystal modulation in order to solve the technical problem that weak image signals completelyannihilated in a strong noise background cannot be effectively extracted through an existing filtering technology. The weak light image reconstruction device comprises a laser; a beam splitter is arranged on an emergent light path of the laser; a light beam entering to the beam splitter is divided into two paths by the beam splitter, an attenuator, a resolution plate and a second reflector are sequentially arranged on one of the two paths, and a first reflector is arranged on the other path; a focusing lens, a scatterer, a collimating lens, a beam combiner, a nematic phase liquid crystal cell,an imaging lens and a CCD detector are sequentially arranged on a reflecting light path of the first reflector; the beam combiner is further located on a reflecting light path of the second reflectorsimultaneously; the scatterer can rotate at the constant speed in the plane perpendicular to the light path where the scatterer is located, and the minimum rotating speed is 1000 r / s; the position, between the focusing lens and the collimating lens, of the scatterer can be adjusted; and a regulating voltage is additionally arranged on the nematic phase liquid crystal cell.

Description

technical field [0001] The invention belongs to the technical field of stochastic resonance reconstruction of low-light images, and in particular relates to a low-light image reconstruction device and method based on liquid crystal modulation instability. Background technique [0002] When detecting image signals in airspace, the signals often have to pass through scattering media such as the atmosphere, water or even smog. These scattering media will absorb and scatter the image signal, which will change the spatial distribution of the image signal, and the scattering noise will seriously reduce the signal-to-noise ratio of the final received image, making the image blurred and unrecognizable. However, when the image signal to be tested is very weak or the image signal is completely obliterated by strong noise, it is difficult for the detector to directly detect the target. Therefore, the non-linear amplification technology of weak image signal under strong noise backgroun...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the existing filtering technology cannot effectively extract the weak image signal completely submerged in the strong noise background, the present invention provides a weak light image reconstruction device and method based on liquid crystal modulation instability

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