Extrapolated Speckle-Correlation Imaging
Extrapolated Speckle-Correlation Imaging
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DOI：
10.34133/2022/9787098
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发表时间：
2022-06
期刊：
影响因子：
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通讯作者：
Yuto Endo;J. Tanida;M. Naruse;R. Horisaki
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文献类型：
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作者：
Yuto Endo;J. Tanida;M. Naruse;R. Horisaki
通过散射介质成像是一个长期存在的问题，在广泛的应用中，包括生物医学，安全和天文学。通过假设散射过程的移位不变性（称为记忆效应），散斑相关成像有望实现穿透散射介质的非侵入性观察。然而，众所周知，当介质较厚时，记忆效应受到严重限制。在这种散射条件下，由于散斑的相关性衰减，缩小了视场，因此散斑相关成像是不现实的。为了解决这一问题，我们提出了一种利用有限记忆效应外推散斑相关来扩大单镜头散斑相关成像视场的方法。导出了该散射条件下的成像模型及其反演，用于重建目标。该方法基于梯度下降法同时估计目标和散斑相关的衰减。通过数值和实验验证了该方法在有限记忆效应散射介质后重建点源。在演示中，我们的散斑相关成像方法与最小的无透镜光学装置相比，实现了更大的视场。本研究将使散射介质成像技术在各个领域更加实用。
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 noninvasively 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.