基于光场调控的散射体后物体三维图像快速恢复研究

光散射是光通过不均匀介质时能流方向发散到任意角度的光传播现象。散射通常限制了成像的清晰度，而通过光场调控方法可有效恢复物体透过散射体后的二维信息，我们对光场振幅与位相调控实现散射体后图像恢复(Opt. Express 2013)、生物膜后重聚焦(Biomed. Opt. Express, 2015)和逆向解卷积实现散射体后成像 (Sci. Rep. 2016)等前期工作已解决了这一问题。但是，在空间侦测和医学光诊疗等应用上，物体的三维信息却依然难以得到恢复。究其原因，散斑的三维光场除了有强度信息外，还具有能流方向信息。为此，本项目将三维显示与成像技术引入到三维散射图像恢复研究中，利用光场摄像仪可记录光场能流方向的特点，一次性记录散射体后的三维点扩散函数与物体三维散斑，并利用逆向解卷积法，实现一种可快速恢复散射体后物体的三维图像的方法，为军事探测和生物医学光诊疗提供可靠的三维图像恢复技术。

Scattering is a general physical process where light is forced to deviate from a straight trajectory by one or more paths due to localized non-uniformities in the medium through which they pass. Scattering limits the resolution of imaging, while most of the bio-membranes are weakly scattering media. It must be significant for optical diagnostics to obtain 3-D images through bio-membranes without damaging it. Based on our researches on digital image recovering by self-correlation function (Opt. Express, 2013), optical refocusing through scattering layer (Biomed. Opt. Express, 2015), and deconvolution for imaging through scattering layer (Sci. Rep. 2016), we intend to use light field camera to manipulate the energy flux of the scattering light field in order to rapidly obtain the 3-D speckle and 3-D point spread function. Therefore, the 3-D images through scattering media can be obtained by means of 3-D deconvolution. This research is especially practical for non-invasive optical diagnostics.