Opt Express. 2023 Feb 13;31(4):6759-6769. doi: 10.1364/OE.483337.
Polarization cameras quantify one of the fundamental properties of light and capture intrinsic properties of the imaged environment that are otherwise omitted by color sensors. Many polarization applications, such as underwater geolocalization and sky-based polarization compass, require simultaneous imaging of the entire radial optical field with omnidirectional lenses. However, the reconstructed angle of polarization captured with omnidirectional lenses has a radial offset due to redirection of the light rays within these lenses. In this paper, we describe a calibration method for correcting angle of polarization images captured with omnidirectional lenses. Our calibration method reduces the variance of reconstructed angle of polarization from 76.2 to 4.1 . Example images collected both on an optical bench and in nature, demonstrate the improved accuracy of the reconstructed angle of polarization with our calibration method. The improved accuracy in the angle of polarization images will aid the development of polarization-based applications with omnidirectional lenses.
偏振相机量化了光的一个基本属性，并捕捉到了成像环境的固有特性，而这些特性是彩色传感器所忽略的。许多偏振应用，如水下地理定位和基于天空的偏振罗盘，需要使用全向透镜同时对整个径向光场进行成像。然而，由于这些透镜内光线的转向，使用全向透镜捕捉到的偏振角的重建会有一个径向偏移。在本文中，我们描述了一种用于校正使用全向透镜捕捉到的偏振角图像的校准方法。我们的校准方法将重建的偏振角的方差从 76.2 降低到 4.1 。在光学台和自然环境中收集的示例图像，展示了我们的校准方法在重建偏振角方面的精度提高。偏振角图像精度的提高将有助于使用全向透镜开发基于偏振的应用。
