Underwater polarimetric imaging for visibility enhancement utilizing active unpolarized illumination

Yang, Liming; Liang, Jian; Zhang, Wenfei; Ju, Haijuan; Ren, Liyong; Shao, Xiaopeng

doi:10.1016/j.optcom.2018.12.022

Cited by 38 publications

(12 citation statements)

References 21 publications

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“…Over the recent years, polarization-based methods have been widely applied to underwater image restoration [35]- [44]. Schechner and Karpel [35] proposed that the degradation of underwater images was related to light polarization.…”

Section: B Polarization Characteristics-based Methodsmentioning

confidence: 99%

“…The method has a good applicability to the restoration of underwater images, but the solution of cost function is complicated. Yang et al [44] presented an underwater image enhancement method using active unpolarized illumination. Compared with traditional polarization imaging, the use of non-polarized illumination can ensure that the polarization effect of the signal light is neglected.…”

Section: B Polarization Characteristics-based Methodsmentioning

confidence: 99%

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A Survey of Restoration and Enhancement for Underwater Images

et al. 2019

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Images captured underwater usually suffer from color distortion, detail blurring, low contrast, and a bluish or greenish tone due to light scattering and absorption in the underwater medium, which in turn the visibility is adversely affected by these factors seriously. Over the last decades, various image restoration and enhancement methods have been developed by many researchers to improve the quality (visibility and highlight richer details) of underwater images. This paper introduces the overview of state-of-the-art underwater image restoration and enhancement techniques and classifies the approaches in two categories: image restoration (physical-based model) and image enhancement (nonphysical-based model). Furthermore, the classification of these two methods is elaborated. Then, the typical underwater image restoration and enhancement methods are discussed in detail, as well as a comprehensive study and fair evaluation of the methods is carried out from both qualitative and quantitative perspectives. Finally, the research process of underwater image restoration and enhancement is summarized and the suggestions for future research are prospected. INDEX TERMSUnderwater image degradation, underwater image restoration, underwater image enhancement, underwater image quality evaluation, transmission map estimation.

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Section: B Polarization Characteristics-based Methodsmentioning

confidence: 99%

Section: B Polarization Characteristics-based Methodsmentioning

confidence: 99%

A Survey of Restoration and Enhancement for Underwater Images

et al. 2019

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“…In the scattering medium, both the sharpness and the contrast of the optical images usually suffer degradations, as shown in several typical situations such as conducting imaging detection through haze, or performing underwater imaging [44][45][46]. Many previous studies revealed that the imaging quality in the scattering medium can be effectively improved by polarization information.…”

Section: Visibility Enhancement In Scattering Mediummentioning

confidence: 99%

All-In-Focus Polarimetric Imaging Based on an Integrated Plenoptic Camera with a Key Electrically Tunable LC Device

Chen

et al. 2022

Micromachines

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In this paper, a prototyped plenoptic camera based on a key electrically tunable liquid-crystal (LC) device for all-in-focus polarimetric imaging is proposed. By using computer numerical control machining and 3D printing, the proposed imaging architecture can be integrated into a hand-held prototyped plenoptic camera so as to greatly improve the applicability for outdoor imaging measurements. Compared with previous square-period liquid-crystal microlens arrays (LCMLA), the utilized hexagonal-period LCMLA has remarkably increased the light utilization rate by ~15%. Experiments demonstrate that the proposed imaging approach can simultaneously realize both the plenoptic and polarimetric imaging without any macroscopic moving parts. With the depth-based rendering method, both the all-in-focus images and the all-in-focus degree of linear polarization (DoLP) images can be obtained efficiently. Due to the large depth-of-field advantage of plenoptic cameras, the proposed camera enables polarimetric imaging in a larger depth range than conventional 2D polarimetric cameras. Currently, the raw light field images with three polarization states including I0 and I60 and I120 can be captured by the proposed imaging architecture, with a switching time of several tens of milliseconds. Some local patterns which are selected as interested target features can be effectively suppressed or obviously enhanced by switching the polarization state mentioned. According to experiments, the visibility in scattering medium can also be apparently improved. It can be expected that the proposed polarimetric imaging approach will exhibit an excellent development potential.

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“…However, when employing linear polarized light to illuminate underwater scenes, the difference in polarization states between the reflected light from target and the stray light cannot be hold any more, which causes the failure of the polarization recovery. In 2019, Yang et al [65] utilized unpolarized light to illuminate the underwater scenes, which verified the polarization effect of the signal light could be ignored regardless of the DOP of the object. This special property expands the application range of underwater polarization imaging.…”

Section: Polarization Imagingmentioning

confidence: 99%

Underwater Optical Imaging: Key Technologies and Applications Review

et al. 2021

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The challenges associated with acquiring the clear images of objects in underwater environment are difficult to overcome due to the absorptive and scattering nature of seawater. Recently, the research community has focused on mitigating these effects. The recent developments in image enhancement algorithms and strategies of signal light enhancement have brought improvement in some application areas. In this work, we review the six most common methods based on signal light enhancement. We present the individual working mechanisms, latest representative advances, and suitable application conditions. Moreover, we also present a detailed comparison of these techniques. In each technique, we present their applicable environments and conditions according to the following indicators: operating distance (from 2 attenuation lengths (AL) to 13.5 AL), resolution (from centimeter to millimeter), and field of view (FOV). By summarizing and analyzing the existing problems that restrict the underwater optical imaging techniques, the future development trends are prospected. INDEX TERMSUnderwater optical imaging, Underwater imaging model, Signal light enhancement, Optical properties of seawater

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Underwater polarimetric imaging for visibility enhancement utilizing active unpolarized illumination

Cited by 38 publications

References 21 publications

A Survey of Restoration and Enhancement for Underwater Images

A Survey of Restoration and Enhancement for Underwater Images

All-In-Focus Polarimetric Imaging Based on an Integrated Plenoptic Camera with a Key Electrically Tunable LC Device

Underwater Optical Imaging: Key Technologies and Applications Review

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