Real-time video output method for underwater active polarization imaging

WU Houde; ZHAI Yuzheng; WANG Hongchang; LI Chiyao; GUO Ruiqi

doi:10.37188/OPE.20243210.1443

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Real-time video output method for underwater active polarization imaging

Modern Applied Optics | 更新时间：2024-06-11

- Real-time video output method for underwater active polarization imaging
- Optics and Precision Engineering Vol. 32, Issue 10, Pages: 1443-1455(2024)
- 作者机构：
  
  大连海事大学信息科学技术学院，辽宁大连 116026
- 作者简介：
  
  E-mail： zyz_9937@dlmu.edu.cn
- 基金信息：
- DOI：10.37188/OPE.20243210.1443
  CLC： TP394.1;TH691.9
- Published：25 May 2024，
  
  Received：05 January 2024，
  
  Revised：21 February 2024，
- 稿件说明：
移动端阅览
吴厚德,翟予峥,王洪昌等.实时输出视频的水下主动偏振成像[J].光学精密工程,2024,32(10):1443-1455.

WU Houde,ZHAI Yuzheng,WANG Hongchang,et al.Real-time video output method for underwater active polarization imaging[J].Optics and Precision Engineering,2024,32(10):1443-1455.
吴厚德,翟予峥,王洪昌等.实时输出视频的水下主动偏振成像[J].光学精密工程,2024,32(10):1443-1455. DOI： 10.37188/OPE.20243210.1443.

WU Houde,ZHAI Yuzheng,WANG Hongchang,et al.Real-time video output method for underwater active polarization imaging[J].Optics and Precision Engineering,2024,32(10):1443-1455. DOI： 10.37188/OPE.20243210.1443.

摘要

针对在水下主动偏振成像方法中，需要机械旋转相机前的检偏器获取正交偏振态图像，导致无法实时输出去后向散射视频的问题，提出了实时输出视频的水下主动偏振成像方法。首先，本方法将正交偏振切换位置从相机端更换到光源端，而相机端的检偏器偏振状态保持不变，并论证了此改变并不影响去后向散射的效果；然后，设计了阵列正交偏振光源，即光源由偏振态正交的两组LED灯珠交错排列组成，通过独立的驱动电路分别控制两组灯珠，输出偏振态正交的偏振光，从硬件上取消了偏振态切换的机械结构；第三，设计了同步控制装置，分别控制光源输出的偏振态和相机拍照，实现了正交偏振态图像数据的采集；最后，通过流水线式主动偏振图像处理方法，实现实时的视频输出。实验结果表明，本方法可以实时输出去后向散射视频，且在去后向散射性能上，与机械式主动偏振成像方法性能接近，两者去后向散射性能的背离度均低于4%，图像EME值增长倍数最大可达17.96。本方法具有结构简单、成本低、输出帧频不受影响以及相机选择性多等优点，能够广泛应用在水下成像领域。

Abstract

In the underwater active polarization imaging method， it is necessary to mechanically rotate the polarizer in front of the camera to obtain the orthogonal polarization state images， which makes it difficult to output the de-backscattering video in real time. The method of real-time video output method for underwater active polarization imaging was proposed. Firstly， the orthogonal polarization switching position was changed from the camera side to the light source side， while the polarization state of the analyzer at the camera end remained unchanged， and it was proved that this change did not affect the effect of de-backscatter. Then， the arrayed orthogonal polarization light source was designed. The light source was composed of two groups of LED lamp beads with orthogonal polarization. The two groups of LED lamp beads were controlled by an independent drive circuit to output polarized light with orthogonal polarization state， and the mechanical structure of polarization state switching was eliminated from the hardware. Third， a synchronous control device was designed to control the polarization state of the light source output and the camera to take pictures， which realized the acquisition of orthogonal polarization state image data. Finally， the pipelined active polarization image processing method was used to realize real-time video output. The experimental results show that the proposed method can output the de-backscattering video in real time， and the performance of the de-backscatter is close to that of the mechanical active polarization imaging method. The deviation degree of the de-backscattering performance of the two methods is less than 4%， and the improvement factor of the image EME value is up to 17.96. This method has the advantages of simple structure， low cost， no influence on output frame rate， and wide selectivity of the camera， and can be widely used in the underwater imaging field.

关键词

主动偏振成像去后向散射阵列正交偏振光源实时视频

Keywords

active polarization imagede-backscatterarrayed orthogonal light sourcereal-time video

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