Research On Large Field Of View Scattering Imaging Based On Optical Memory Effect

The visual information of the target is mainly propagated through light,when there is a scattering medium in the path,the originally clear target will become chaotic due to the interference of the scattering medium.How to achieve reconstruction of targets behind scattering media is of great significance.In recent years,some scattering imaging methods based on optical memory effect have been developed rapidly with simple structure and no invasion.However,the imaging range of optical memory effect is limited.How to reconstruct a large field of view target behind the scattering medium in the event of target light scattering is an urgent problem to be solved.In this paper,research on scattering imaging in large field of view based on optical memory effect is carried out,and a scattering imaging solution for large field of view targets is proposed,the work carried out is introduced as follows:The paper provides a detailed introduction to the current research status of scattering imaging both domestically and internationally,and points out the importance of large field scattering imaging.The cause of scattering and the intensity distribution of optical speckle are described,and the theoretical study of optical memory effect of scattering medium is introduced.When different point light sources that form the target light field penetrate the scattering medium at a certain angle range of the central optical axis,the series of speckle generated by these point sources have high similarity.The article presents the work on a multi target large field of view scattering imaging method based on speckle correlation.By establishing the scattering theory model of the scattering medium,the method based on speckle autocorrelation have been achieved both in simulation and real-time reconstruction of unknow targets which behind the scattering media.The results show that the speckle correlation method based on the optical memory effect can reconstruct the unknown target,but the reconstruction position is not clear and the reconstruction details are unstable.At the same time,the reconstruction method of large field of view targets in different optical memory effect ranges is studied.The problem of limited imaging range of optical memory effect is solved by introducing prior target information,and the reconstruction of unknown targets in large field of view multiple targets is realized.By comparing this method with a single large field of view object reconstruction without prior information,the results show that the introduction of prior objects for large field of view reconstruction is feasible.In order to make the reconstruction effect more efficient for the large field of view,this paper,a non-invasive super-memory effect scattering imaging method based on adaptive β-parameter hybrid input-output(APHIO)algorithm-assisted point spread function(PSF)estimation is proposed.An iterative algorithm APHIO is designed to use the speckle autocorrelation region to constrain the iterative region and optimize the value of the parameter β in the traditional HIO algorithm.Besides,the estimated PSF of the imaging system is combined with a new scanning method to better reconstruct the target object with super-memory effect range.The results show that the APHIO algorithm has the characteristics of faster convergence and more stable reconstruction quality than the traditional HIO algorithm.The overall imaging framework has a good performance in the reconstruction efficiency of the target with super-memory effect range.