基于激光偏振技术的海洋牧场水下成像技术研究

良好的水下视觉环境是推动海洋经济发展的前提,海洋牧场的建设对水下成像技术提 出 新的要求,但是受水体环境吸收及散射影响,光信息丢失严重,用常规光学成像方式进行水 下 图像获取会有可视距离短,图像模糊不清,对比度低等缺点。为解决海洋牧场水下成像清晰 度 低的问题,提出一种通过532 nm激光光源与偏振技术相结合的方法并 集成了一款水下相机。 532 nm波段的绿色激光光源在水体环境中受到水体影响较小,传播效 果更佳,偏振成像技术在去 背景光散射中应用广泛,采用532 nm激光光源与偏振成像技术相结合 的方法进行水下图像的获 取,并在模拟海水环境的水池中进行了海参图像获取的实验,实验结果证明在某一偏振角度 下, 532 nm激光光源与偏振成像技术相结合的方式获取的海参图像相比于 自然光下获取的原图像对比 度、清晰度更高,含有的图像信息更加丰富,验证了此方法在水下成像的可行性。

Research on underwater imaging technology of ocean Ranch based on laser polariza tion technology

A good underwater visual environment is a prerequisite for promoting th e development of marine economy.The construction of marine pastures puts forward new requirement s for underwater imaging technology.However,due to the absorption and scattering of the water e nvironment,the loss of light information is serious.Conventional optical imaging methods are used for underwater imaging. Image acquisition has shortcomings such as short visible distance,blurred image s,and low contrast.In order to solve the problem of low definition of underwater imaging of ocean past ures,a method combining 532nm laser light source and polarization technology is proposed and an underwater camera is integrated.The 532nm band green laser light source is less affected by the w ater body in the water environment,and the propagation effect is better.Polarization imaging technolo gy is widely used in removing background light scattering.The combination of 532nm laser light sourc e and polarization imaging technology is used for underwater image acquisition.The sea cucumber im age acquisition experiment was carried out in a pool that simulates seawater environment.The ex perimental results prove that the sea cucumber image acquired by the combination of 532nm laser li ght source and polarization imaging technology at a certain polarization angle is compared with the sea cucumber image acquired under natural light.The original image has higher contrast and s harpness,and contains richer image information,which verifies the feasibility of this method in under water imaging.