基于像素偏振片阵列的实时水下目标成像技术

Real-Time Underwater Target Imaging Technology Based on Pixelated Micropolarizer Array

摘要:

借助偏振成像可以增强水下目标的探测效果。传统的偏振成像方法需要光学检偏器的机械转动来实现,这限制了其在水下的实时探测性能。采用基于像素偏振片阵列图像传感器开发的相机设计了一种水下实时成像系统。系统通过阵列上排布的四向微偏振片一次性捕获四向偏振图像,从而全局估算背景杂散光的偏振角和偏振度。然后利用偏振信息反解得到杂散光光强,最后借助水下成像物理模型得到去散射后的目标增强图像。实验结果表明,将像素偏振片阵列图像传感器应用到水下成像能够有效增强水下图像的对比度,且成像处理过程实时快速,进一步提高了水下目标的探测效率。

Abstract:

Polarization imaging can enhance the detection of underwater targets, but the traditional method requires mechanical rotation of the optical polarization analyzer to realize underwater detection, which limits its real-time performance. In this paper, an underwater real-time imaging system was designed by using a camera based on pixelated micropolarizer array. The system captures the four-directional polarized image at one time through the four-directional polarizer so as to estimate the polarization angle and polarization degree of the background stray light globally. Then the stray light intensity can be estimated by using the polarization information, and finally the de-scattered target enhanced image is obtained. The experimental results show that applying the micropolarizer array to underwater imaging can effectively enhance the contrast of underwater images, and the imaging process is fast and real-time,thus the detection efficiency of underwater targets is further improved.