论文标题
推断的斑点相关成像
Extrapolated speckle-correlation imaging
论文作者
论文摘要
在包括生物医学,安全和天文学在内的广泛应用中,通过散射介质进行成像是一个长期存在的问题。通过假设称为内存效应的散射过程,通过散射培养基观察斑点相关成像,可以通过散射介质进行非侵入性观察。但是,当培养基厚时,已知记忆效应受到严重限制。在这种散射条件下,斑点相关成像是不切实际的,因为斑点衰变的相关性减少了视野。为了解决这个问题,我们提出了一种通过有限的记忆效应来推断相关性来扩展单次斑点相关成像的视野。我们在这种散射条件下得出成像模型及其重建对象的反转。我们的方法同时根据梯度下降法估算了斑点相关的对象和衰减。我们在数值和实验上通过重建散射介质背后的点源具有有限的记忆效果来证明所提出的方法。在演示中,我们的斑点相关成像方法具有最小的无透镜光学设置,与传统的光学设置相比实现了更大的视野。这项研究将通过在各个领域更实用的散射媒体进行成像制造技术。
Imaging through scattering media is a longstanding issue in a wide range of applications, including biomedicine, security, and astronomy. Speckle-correlation imaging is promising for non-invasively seeing through scattering media by assuming shift-invariance of the scattering process called the memory effect. However, the memory effect is known to be severely limited when the medium is thick. Under such a scattering condition, speckle-correlation imaging is not practical because the correlation of the speckle decays, reducing the field of view. To address this problem, we present a method for expanding the field of view of single-shot speckle-correlation imaging by extrapolating the correlation with a limited memory effect. We derive the imaging model under this scattering condition and its inversion for reconstructing the object. Our method simultaneously estimates both the object and the decay of the speckle correlation based on the gradient descent method. We numerically and experimentally demonstrate the proposed method by reconstructing point sources behind scattering media with a limited memory effect. In the demonstrations, our speckle-correlation imaging method with a minimal lensless optical setup realized a larger field of view compared with the conventional one. This study will make techniques for imaging through scattering media more practical in various fields.