Research On Property Of Pseudo-thermal Light Field In Ghost Imaging

As a new imaging technology,ghost imaging has its own advantages such as antiscattering and fast imaging in computional ghost imaging.Therefore,it's getting more and more attention from researchers.The quality of image is effectively influenced by the illumination light field.Researchers use vairous methods to design illumination light field especially in computional ghost imaging.Estimating and improve the quality of illumination light is a noticeable problem.It is a commen light field evaluation method to estimate quality of light field by the imaging quality at this stage.Besides,some different effort has been made on designing light field,which is somehow helpful for improving the quality of image.However,that illumination light is easily disturbed while propogating,and noise from detectors,and the algorithm used in reconstructing image will have influence on quality of image.That causes using parameters of quality of ghost imaging to estimate quality of light field may not be accurate.While designing the light field,lacking principle makes it hard to design light field,which is important in computional ghost imaging.In a word,lacking a evaluation creterion of illumination field has become a factor that has influence on desiging the light field.According to above,our results are shown below:1,We estimated the light field with the help of light field covariance matrix,and established a map between object and image,then proved that this method is correct;2,We acquired the expression of signal-to-noise ratio in the condition that noise from bucket detector is added into proceed of ghost imaging.Then we put up with a principle:light field with higher variance has better ability of anti-noise;3,We used different data from experiment to verify the conclusion.It has been proved that our conclusion can estimate quality of illumination light field without obtaining the image.In addition,this conclusion is helpful for designing ilumination light field.