朱叶青; 王星; 朱竹青

doi:10.7498/aps.74.20241582

摘要

偏振成像技术在去除后向散射光方面是有效的. 针对该技术依赖免靶区域以计算后向散射光信息限制其适用范围和实时成像能力的问题, 本文提出了无免靶区域的偏振成像方法. 该方法结合主动偏振成像和透射率去散射模型, 将相机接收到的图像分解为具有偏振信息和无偏振信息的部分, 具有偏振信息的部分采用主动成像模型计算, 而无偏振信息的部分基于Stokes矢量计算. 同时, 结合透射率校正原理实现去散射. 实验和真实世界水下成像结果表明, 本文方法能够有效去除大部分后向散射光, 且具有速率优势, 能够助力实时复杂条件下的水下成像技术, 在海底资源探测与研究等领域具有广阔的应用前景.

关键词:

Abstract

Underwater optical imaging technology possesses broad application prospects in fields such as marine resource exploration, underwater ecological environment monitoring, and seabed topography detection. The technology employs the polarization characteristics of light, particularly those of the background and target, to achieve a clear image. However, the traditional methods rely on target-free regions to compute the backscattered light information, which is infrequently present in the actual scene captured by the camera. Then the full-space resolution of target information light and backscattered light information are required. At this time, the traditional methods may be difficult to adapt in practical application.In this work, an underwater polarization de-scattering method independent of target-free regions is proposed by combining active polarization imaging and transmittance de-scattering model. Initially, the total light intensity within the camera’s field of view is decomposed into its polarized and unpolarized components. By removing the backscattered light with polarized and unpolarized information from the total light intensity, a clear underwater target can be obtained. Based on the active polarization imaging model, the backscattered light with polarization information is calculated, in which the polarization angle of the backscattered light is considered to be zero in the full-space. Thus, the polarization degree of the target information light occupying the camera’s entire field of view can be derived. According to the polarization correlation, the polarization degree of the backscattered light can be characterized, and the intensity of the backscattered light with polarization information in the camera’s entire field of view can also be obtained. Then the unpolarized component is calculated using the minimum intensity image with Stokes vector transformation. Finally, the underwater scene is obtained by combining the transmittance de-scattering principle and introducing adjustment parameters.Experimental and real-world underwater imaging results demonstrate that the proposed method can effectively remove the majority of the backscattered light and improve the image contrast and entropy, regardless of whether there are target-free regions. Additionally, this method possesses a certain rate advantage, which can facilitate the real-time complex underwater imaging technology.

Keywords:

作者及机构信息

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通信作者: 朱竹青, zhuqingzhu@njnu.edu.cn

基金项目: 国家自然科学基金(批准号: 12174196)和中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室(批准号: SKLAO2022001A17)资助的课题.

Authors and contacts

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Corresponding author: ZHU Zhuqing, zhuqingzhu@njnu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant No. 12174196) and the State Key Laboratory of Optical Technology for Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences (Grant No. SKLAO2022001A17).

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下载: 全尺寸图片幻灯片

Figures	Evaluation	Intensity	Schechner	CLAHE	PDS	Our
(a1)—(a5)	Entropy	7.0835	5.2074	7.1600	6.3775	6.9319*
(a1)—(a5)	Contrast	0.2933	–∞	0.3620	0.7076	0.4968*
(b1)—(b5)	Entropy	7.1815	7.2357	7.2334	7.0689	7.3007
(b1)—(b5)	Contrast	0.3495	–∞	0.4143	0.6053	0.5608*
(c1)—(c5)	Entropy	6.6501	6.8566	7.3142	6.0976	6.9915*
(c1)—(c5)	Contrast	0.1996	0.7476	0.3625	0.3573	0.4523*
(d1)—(d5)	Entropy	6.6219	6.0931	7.1348	6.5029	6.7891*
(d1)—(d5)	Contrast	0.1947	–∞	0.3249	0.4311	0.4566
(e1)—(e5)	Entropy	6.8163	6.2458	7.1551	6.9662	7.1863
(e1)—(e5)	Contrast	0.2249	–∞	0.2909	0.3916	0.3725*

下载: 导出CSV

	Schechner	PDS	Our work
Average time/s	5.33	12.73	1.78

下载: 导出CSV

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Underwater polarization de-scattering imaging independent of target-free region

摘要

Abstract

作者及机构信息

1.

2.

3.

通信作者: 朱竹青, zhuqingzhu@njnu.edu.cn

Authors and contacts

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3.

Corresponding author: ZHU Zhuqing, zhuqingzhu@njnu.edu.cn

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Underwater polarization de-scattering imaging independent of target-free region

摘要

Abstract

作者及机构信息

1. 2. 3.

通信作者: 朱竹青, zhuqingzhu@njnu.edu.cn

Authors and contacts

1. 2. 3.

Corresponding author: ZHU Zhuqing, zhuqingzhu@njnu.edu.cn

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