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Restoring Polarization Angle Map for High- Fidelity underwater imaging

Journal of Beijing Institute of Technology 2022年第2期31卷 178-184页

作者： Yiming Li Liheng Bian Yangtze Delta Re-gion Academy of Beijing Institute of Technology(Jiaxing) Jiaxing 314019China School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China.

Obtaining polarization information enables researchers to enhance underwater imaging quality by removing backscattering effect and to distinguish targets of different ***,due to the simplified assumption of unpolarized target light,most of the existing underwater polari-metric methods lose part of the polarization information,resulting in degraded imaging *** this work,a novel underwater polarimetric method is reported,which obtains the angle of polariza-tion(AOP)map to improve imaging ***,the Stokes vectors were exploited to re-move the backscattering effect by obtaining two pairs of orthogonal polarization sub-images of the underwater *** target reflected light and the angle between the polarization directions of the target reflected light and the backscattered light were computed through the two groups of the or-thogonal polarized *** AOP map of the target light could be derived from the Stokes ***,the transmission map of the target light was estimated by using the non-local color priorly combined with the properties of light propagating *** show that the reported technique enables distinguishing different targets when the colors are *** quantit-ative metrics validate that the reported technique produces state-of-the-art performance for under-water imaging.

关键词： underwater imaging polarization angle of polarization(AOP) Stokes vector

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Nonuniformly Illuminated Image Enhancement Based on Range-gated underwater imaging System

Nonuniformly Illuminated Image Enhancement Based on Range-ga...

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2008InternationalConferen...

作者： Hailan Li~* Xia Wang Tingzhu Bai Weiqi Jin Youwei Huang Kun Ding Dept.of Optics Engineering School of Information Science Technology Beijing Institute of Technology Beijing China 100081

＜正＞Range-gated underwater laser imaging technique can eliminate most of the backscattering and absorption noise *** has a range of from 4 to 6 times that of a conventional camera with floodlights in the strongly scattering waters,which becomes a useful technique in oceanic research,deep-sea exploration,underwater remote control and robotic *** because of the laser pulse stretching,the image obtained through range gated underwater imaging system has obvious nonuniformly illuminated character,such as brighter center and darker *** contrast and grayish white of the image also bring great difficulty for *** order to adjust the lightness of the nonuniformly illuminated image of range-gated underwater imaging system,the water degradation is assumed as illumination variation and retinal-cortex theory based on color constancy is *** integral algorithm has to be applied first to eliminate system noise for the reason that we adopt the system based on intensified gate imaging *** gray stretch ensures that we can attain appropriate *** retinal-cortex models,McCann model and McCann-Frankle model have obvious *** we choose the two models for comparison and improve the second one considering the exponential characteristics of eyes for *** order to evaluate the methods objectively,strength uniformity of signals is *** experimental results demonstrate that the approaches we adopted are all effective and can enhance the image *** the improved McCann-Frankle model gets more satisfying visual effect.

关键词： Nonuniformly illuminated image range gated underwater imaging

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SIMULATION STUDY OF imaging OF underwater BOTTOM TOPOGRAPHY BY SYNTHETIC APERTURE RADAR

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Journal of Hydrodynamics 2001年第3期13卷 57-64页

作者： Ma, Yi Zhang, Jie First Inst. of Oceanography State Oceanic Administration Qingdao 266061 China

Interaction between current and underwater bottom topography modulates roughness of the sea surface, which in turn yields variation of the radar scattering echo. By using the mechanism, this paper presents a simulation model for Synthetic Aperture Radar (SAR) imaging of underwater bottom topography. The numerical simulations experiments were made using the Princeton Ocean Model (POM) and analytical expression theory of SAR Image in Mischief sea area. It is concluded that the SAR image is better visual when water depth of underwater bottom topography is shallow or gradient of underwater bottom topography is high.

关键词： Numerical analysis Ocean currents Simulation Synthetic aperture radar underwater imaging underwater structures

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underwater 3-D imaging and Detection by Laser Plane Scanning

Underwater 3-D Imaging and Detection by Laser Plane Scanning

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第三届国际仪器科学技术学术研讨会

作者： WANG Zong-yi SHAN Yi LI Hong-wei Automation College Harbin Engineering University Harbin 150001 China

In order to satisfy the requirements of the high precision detection for autonomous underwater vehicles (AUV) at close range, and considering the difficulty and inaccuracy of reconstructing 3-D shape

关键词： laser scanning underwater imaging active triangulation image processing

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Depolarization index from Mueller matrix descatters imaging in turbid water

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Chinese Optics Letters 2022年第2期20卷 160-165页

作者：刘飞张仕超韩平丽陈方熠赵琳范颖颖邵晓鹏 School of Physics and Optoelectronic Engineering Xidian UniversityXi’an 710071China Xi’an Key Laboratory of Computational imaging Xi’an 710071China Academy of Advanced Interdisciplinary Research Xidian UniversityXi’an 710071China State Key Laboratory of Optical Engineering Chinese Academy of SciencesChengdu 610209China

Polarization underwater imaging is of great potential to target detection in turbid water. Typical methods are challenged by the requirement on degrees of polarization(Do Ps) of both target light and backscattering. A polarization descattering imaging method was developed using the Mueller matrix, which in turn derived a depolarization(Dep) index from the Mueller matrix to characterize scattering media by estimating the transmittance map by combining a developed optimal *** quantifying light attenuation with the transmittance map, a clear vision of targets can be recovered. Only using the information of scattering media, the underwater vision under diverse water turbidity was enhanced by the results of experimental data.

关键词： Mueller matrix scattering depolarization underwater imaging

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The application of underwater optics and its development

The application of underwater optics and its development

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2007亚洲光电子会议信息光学与光子学技术分会场

作者： LV Pei1 ,2, HE Junhua 1, Zhou Renkui1 , Liu Haiying1 ,2 1 Xi’an Institute of Optics and Precision Mechanics of CAS, Xi’an 710119, China 2 Graduate School of Chinese Academic of Sciences, Beijing 100039, China

After concluding the application of under-water optics, the development of under-water laser imaging technology is reviewed. The main types of laser imaging technology are introduced, such as laser scanning imaging, distance selected imaging, and three-dimensional technology. The respective imaging principle, characteristics and update status are presented. Furthermore, the newest detecting technology, such as fiber optic hydrophone, under-water holograph and under-water spectrum detecting technology are described in detail. The recent researching status and new application are included.

关键词： underwater imaging laser scanning range gated selection polarized laser imaging holography detecting underwater laser communication

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