Research On The Compensation Method Of Environmental Noise In Ghost Imaging System

Quantum correlation imaging,also known as ghost imaging,has been gradually developing from theory research in the laboratory to application in engineering after more than 20 years.It is increasingly applied in remote sensing,national defense,imaging radar,satellite imaging and medical imaging,because of its anti-interference,super-resolution,imaging in weak background and non-locality.This condition of application is also bad and complex,and it is also a challenge for the wide application of ghost imaging.The main effort of paper is to analyze and compensate the environment interference suffered by ghost imaging system in application.Based on the discussion of the principle and algorithm of ghost imaging,this paper analyzes and models the error interference in each part of imaging system.The fluctuation of light or leaser,the error of expansion system,the error in spatial light modulator,optical system and detector are discussed.The environmental interference is also discussed,including relative motion between object and imaging system,scattering media interference in imaging path and transmission path,and the stray light interference.A tracking compensation strategy in proposed for the motion of imaging system and targets.The correlation between the reference light field and the value of bucket detector is lost due to the interference motion.This method can improve the quality of result and eliminates the motion blurry by restoring the correlation of light field and the value of bucket detector.Through simulation and experiment,it is concluded that the tracking compensation strategy can effectively eliminate motion interference.Finally,two compensation strategies are proposed for the scattering interference in imaging optical path.Through theoretical analysis,the light field transmitted through the scattering medium is divided into two parts.One part is the same as the reference light field,and the other part is the light field destroyed by the scattering medium.So that the final imaging result is superimposed by clean image and destroyed image.A method of proportional modulation and exponential modulation of the barrel detector in the second-order correlation algorithm is proposed to compensate the interference of the scattering medium.The image quality,peak signal-to-noise ratio,structural similarity and section strength of the experimental results are adopted.The comparison shows the validity of the two compensation methods.