Naik Nikhil, Barsi Christopher, Velten Andreas, Raskar Ramesh
J Opt Soc Am A Opt Image Sci Vis. 2014 May 1;31(5):957-63. doi: 10.1364/JOSAA.31.000957.
Imaging through complex media is a well-known challenge, as scattering distorts a signal and invalidates imaging equations. For coherent imaging, the input field can be reconstructed using phase conjugation or knowledge of the complex transmission matrix. However, for incoherent light, wave interference methods are limited to small viewing angles. On the other hand, time-resolved methods do not rely on signal or object phase correlations, making them suitable for reconstructing wide-angle, larger-scale objects. Previously, a time-resolved technique was demonstrated for uniformly reflecting objects. Here, we generalize the technique to reconstruct the spatially varying reflectance of shapes hidden by angle-dependent diffuse layers. The technique is a noninvasive method of imaging three-dimensional objects without relying on coherence. For a given diffuser, ultrafast measurements are used in a convex optimization program to reconstruct a wide-angle, three-dimensional reflectance function. The method has potential use for biological imaging and material characterization.
通过复杂介质进行成像面临着一个众所周知的挑战，因为散射会使信号失真并使成像方程无效。对于相干成像，可以使用相位共轭或复透射矩阵的知识来重建输入场。然而，对于非相干光，波干涉方法仅限于小视角。另一方面，时间分辨方法不依赖于信号或物体的相位相关性，这使得它们适用于重建广角、大尺度的物体。此前，已证明一种时间分辨技术可用于均匀反射物体。在此，我们将该技术推广到重建被角度相关漫射层隐藏的形状的空间变化反射率。该技术是一种无需依赖相干性即可对三维物体进行成像的非侵入性方法。对于给定的漫射器，在凸优化程序中使用超快测量来重建广角三维反射率函数。该方法在生物成像和材料表征方面具有潜在用途。
