Imaging with Local Speckle Intensity Correlations: Theory and Practice
Imaging with Local Speckle Intensity Correlations: Theory and Practice
复制标题
局部散斑强度相关成像：理论与实践
DOI：
10.1145/3447392
复制
发表时间：
2021-06-01
影响因子：
6.2
通讯作者：
Levin, Anat
中科院分区：
文献类型：
--
作者：
Alterman, Marina;Bar, Chen;Levin, Anat
通过利用捕获的散斑强度模式的自相关特性，计算成像的最新进展极大地扩展了我们通过散射层（如生物组织）进行成像的能力。然而，这种能力的大多数实验演示都集中在远场成像设置上，在远场成像设置中，被遮挡的光源离散射层很远。相比之下，诸如荧光成像之类的医学成像应用在近场成像设置中操作，其中源位于散射层内。我们对两种环境的异同进行了理论和实验研究，强调了近场环境带来的挑战。然后，我们从这一分析中得出见解，开发一种新的散射成像算法，该算法通过利用在该设置下形成的散斑图案的独特属性（例如它们的局部支持），为近场设置量身定制。我们对该算法的优点进行了理论分析，并在远场和近场配置下进行了实际实验，结果表明，可以恢复的被遮挡图案的范围和密度都有一个数量级的扩展。
Recent advances in computational imaging have significantly expanded our ability to image through scattering layers such as biological tissues by exploiting the auto-correlation properties of captured speckle intensity patterns. However, most experimental demonstrations of this capability focus on the far-field imaging setting, where obscured light sources are very far from the scattering layer. By contrast, medical imaging applications such as fluorescent imaging operate in the near-field imaging setting, where sources are inside the scattering layer. We provide a theoretical and experimental study of the similarities and differences between the two settings, highlighting the increased challenges posed by the near-field setting. We then draw insights from this analysis to develop a new algorithm for imaging through scattering that is tailored to the near-field setting by taking advantage of unique properties of speckle patterns formed under this setting, such as their local support. We present a theoretical analysis of the advantages of our algorithm and perform real experiments in both far-field and near-field configurations, showing an order-of magnitude expansion in both the range and the density of the obscured patterns that can be recovered.