Research On Three-Dimensional Ghost Imaging By Time-of-Flight Method

In the past two decades,ghost imaging has become more and more a hot spot in the field of scientific research,different from the traditional direct imaging optical imaging method,the indirect imaging method used by ghost imaging has unique advantages in anti-interference or harsh conditions,making the originally difficult to image scenarios become imaging.Compared with traditional imaging,the ghost imaging algorithm is simpler,has lower requirements for equipment accuracy,and has lower cost,simpler equipment,and more convenient debugging than radar imaging.In order to solve the problem of poor quality,based on the time-of-flight method of light,this paper proposes to combine differential ghost imaging and noise phagocytosis algorithm,and improve the image quality of the reconstructed three-dimensional ghost imaging by combining differential,setting threshold,noise phagocytosis and other methods.Firstly,the differential method is used to reduce the surrounding dark environment noise,and the remaining noise is solved by setting the threshold,and secondly,for the glitch of the object on the reconstructed image,a noise engulfing algorithm is proposed to remove the glitch on the object by combining three-dimensional weighted median filtering and bilateral filtering.In order to verify the proposed algorithm,this paper builds a set of laser 3D ghost imaging experimental system based on pseudothermal light,introduces the composition of the 3D ghost imaging system in detail,and gives the experimental verification of 3D ghost imaging,and combines the differential ghost imaging algorithm(DGI)to realize 3D ghost imaging based on light flight,and the influence of laser power of experimental light source and threshold parameters in reconstruction in 3D correlation imaging is studied and analyzed.It is found that the intensity of background noise is much lower than the signal intensity through experiments,so this paper uses the method of setting threshold parameters to process the received signal,zero the image pixels below the threshold,and retain the pixels above the threshold,thereby improving the image quality in the reconstruction process.Finally,according to the characteristics of ghost imaging,this paper reduces the threedimensional ghost imaging reconstruction noise,improves the signal-to-noise ratio of the image,significantly improves the quality of the image,subjectively makes the stars and letters T clearer through experiments,and the relative position does not change,and the objective evaluation data show that compared with before optimization,the optimized NRSS,Brisque and Niqe values are increased by 45%,25% and 33%,respectively.