Metalens‐Assisted System for Underwater Imaging

The ability to image under water is highly desirable for a variety of applications including biological monitoring and seafloor survey, yet the image quality is usually hampered by the presence of scattering medium in water. Polarization imaging has proven to be an effective method for image enhance...

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Veröffentlicht in:Laser & photonics reviews 2021-08, Vol.15 (8), p.n/a
Hauptverfasser: Zhao, Feng, Lu, Rusi, Chen, Xiangning, Jin, Chunqi, Chen, Sai, Shen, Zicheng, Zhang, Cheng, Yang, Yuanmu
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container_title Laser & photonics reviews
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Lu, Rusi
Chen, Xiangning
Jin, Chunqi
Chen, Sai
Shen, Zicheng
Zhang, Cheng
Yang, Yuanmu
description The ability to image under water is highly desirable for a variety of applications including biological monitoring and seafloor survey, yet the image quality is usually hampered by the presence of scattering medium in water. Polarization imaging has proven to be an effective method for image enhancement; however, conventional systems require mechanically rotating polarizers which compromises the system's footprint or a set of polarization filters which limits the system's efficiency. Here, a compact polarization imaging apparatus that leverages a multifunctional planar dielectric metalens to simultaneously capture two orthogonally polarized images of an underwater scene is presented. Using a metalens to image target objects through milky water in a single shot, large enhancement of image contrast and depth estimation of target objects in real‐time are demonstrated. This work shows the effectiveness of metalens for tackling challenging imaging tasks in complex environments. A compact polarization imaging apparatus that leverages a multifunctional planar dielectric metalens to simultaneously capture two orthogonally polarized images of an underwater scene is presented. Using a metalens to image target objects through milky water in a single shot, large enhancement of image contrast and depth estimation of target objects in real‐time are demonstrated.
doi_str_mv 10.1002/lpor.202100097
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subjects Biomonitoring
depth estimation
Image contrast
Image enhancement
Image quality
metalens
Ocean floor
Polarization
polarization imaging
Polarizers
System effectiveness
Target recognition
Task complexity
Underwater
underwater imaging
title Metalens‐Assisted System for Underwater Imaging
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