Expansion of the FOV in speckle autocorrelation imaging by spatial filtering.
Expansion of the FOV in speckle autocorrelation imaging by spatial filtering.
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DOI：
10.1364/ol.44.005997
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发表时间：
2019-12
期刊：
影响因子：
3.6
通讯作者：
Meijun Chen;Honglin Liu;Zhentao Liu;Puxiang Lai;Shensheng Han
中科院分区：
文献类型：
--
作者：
Meijun Chen;Honglin Liu;Zhentao Liu;Puxiang Lai;Shensheng Han
由于散射介质的光记忆效应有其固有的角度范围，基于自相关的非均匀介质光学成像存在视场受限的问题。本文利用空间滤波技术选择低频分量，主要是弹道光和少量散射光，成功地扩大了散斑自相关成像的视场范围。给出了仿真和实验验证。该技术不局限于所讨论的4f结构，可以为设计通过散射介质成像的光学系统提供指导。
Optical imaging through inhomogeneous media based on autocorrelations suffers from a limited field of view (FOV), since the optical memory effect (ME) of a scattering medium has its inherent angular extent. Here we successfully expand the angular ME range by exploiting a spatial filtering technique to select low-frequency components, mainly ballistic light and less scattered light, thereby increasing the FOV of the speckle autocorrelation imaging. Both a simulation and experimental verifications are presented. This technique, which is not limited to the discussed 4f structure, can provide a guideline for the design of an optical system to image through scattering media.