透过散射介质对运动物体的成像与追踪

Imaging and Tracking Moving Objects Through Scattering Medium

由于散射介质的强散射作用,传统光学成像系统无法对散射介质后的物体进行成像与运动追踪。针对这一问题,提出了一种透过散射介质对运动物体进行追踪与重建的方法。基于散射介质的光学记忆效应理论,通过先验信息解算散射成像系统的点扩展函数,利用点扩展函数的轴向缩放关系确定轴向位移,利用重建物体的互相关确定横向偏移。基于此方法搭建的实验系统也很好地实现了散射介质后物体的快速重建与运动追踪。所提方法仅需采集移位物体的连续散斑图像即可追踪物体位移,无需特定装置且效果优异,有利于透过散射介质成像在生物医学领域的应用。

Because of the strong scattering effect of scattering media,the traditional optical imaging systems cannot be used to image and track objects behind these media.To address this problem,this paper proposes a method for tracking and reconstructing the moving objects behind a scattering medium.Based on the theory of optical memory effect of scattering media,the point spread function of a scattering imaging system is solved using prior information.The axial scaling relationship of this point spread function is used to determine the axial displacement and the cross-correlation of the reconstructed moving objects is used to determine the lateral offset.An experimental system based on the proposed method also achieve the fast reconstruction and motion tracking of an object behind the scattering medium.The proposed method can track object displacement by collecting only continuous speckle images of the displaced object.Thus,this approach does not require specific devices but provides excellent results,which is helpful in the application of imaging moving objects through scattering media in the field of biomedicine.