In the analysis of underwater target imaging technology, underwater polarization imaging technology can be studied by detectors with polarizers. It was concluded that polarization imaging can be used as a complementary approach to obtain target details. In a haze environment, Xu Xian conducted polarization imaging on plastic objects and metal objects under low background illumination. It can be used to quickly identify metal chips. It was concluded that the polarization degree of a metal target is obviously higher than that of other objects. Xiong Zhihang studied the polarization degree information of metal aluminum plates, cloth, rubber, ceramics, sediment and paper through a linear polarization imaging experiment. In the study, it was observed that there are different reflectivity ratios between metals and nonmetals within a certain observation angle range, and a Fresnel reflectivity ratio method was proposed to distinguish metal and nonmetal targets. Liu Zhe proposed a material classification method based on polarized light imaging. For targets with different polarization characteristics, different processing methods are used to obtain high-resolution images. Han Jiefei designed a polarization imaging experimental system based on LED auxiliary lighting. The conclusion was that the degree of polarization of the target with a smooth surface is higher than that of the target with a rough surface. Bao Fucheng studied the influence of different materials on polarization imaging through an underwater polarization experiment. It is proved that the polarization image contains enough brightness information and rich detail information that is easy for human eyes to recognize. He conducted polarization imaging on targets with six different materials. In an underwater low-visibility scene, the method of focal plane polarization imaging proposed in this paper can reduce the difficulty of metal target detection.īesker used the method of rotating the polarizer. The results show that under the condition of low visibility, the obtained polarization image contrast of the metal target is relatively high, and its EME, information entropy and average gradient are increased by 183.82%, 53.46% and 586.22% on average relative to the image of light intensity. The polarization characteristics of metal and nonmetal target plates are analyzed. Under different underwater low-visibility conditions, polarization imaging of targets with different materials can be realized finally, an image quality evaluation system is constructed to compare the light intensity and degree of polarization images that are collected by the focal plane polarization imaging system. Variational contrast and saturation enhancement algorithms are used to reduce the underwater scattering effect secondly, a split-focus plane polarization imaging system is built to complete the control of camera parameters, polarization image acquisition and information processing. In this study, the GrayWorld method is improved to compensate the attenuation difference of the total light intensity of the polarization image. Firstly, a hybrid enhancement method is proposed to clarify the degraded polarization image. Aiming at the problems of brightness attenuation and contrast reduction in the target image caused by underwater low-visibility environments, a metal target detection method based on split-focus plane polarization imaging is proposed.
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