强光背景下主动偏振成像方法

Active polarization imaging method under strong light

针对传统光电探测方法在强光背景下目标探测对比度低的问题,本文提出一种基于激光照明的主动偏振成像方法。首先构建激光入射双向反射分布模型、激光入射偏振双向反射分布模型以及激光照明的目标表面偏振度模型,并分析3种典型目标材料偏振特性与束散角之间的耦合关系。然后在暗室可控条件下开展逆光观测实验,验证目标偏振特性受激光束散角的影响。实验结果表明:强光背景下主动偏振成像目标对比度与传统被动强度成像相比提升了86.11%,不同束散角下不同目标材料的可见光偏振特性间存在差异,金属材质相对于非金属材质的线偏振度提升更高,实验结果与理论分析具有较好的一致性。最后,在室外开展太阳逆光观测实验,验证了研究方法在室外高强光、远距离下依旧具有适用性。本研究为提升强光背景下的目标精准感知能力奠定了理论基础。

In this study,we propose an active polarization imaging method based on laser illumination to tackle the issue of low target detection contrast in strong light backgrounds,which is a challenge in conventional photoelectric detection.Through constructing a laser incident bidirectional reflection distribution model,a laser incident polarization bidirectional reflection distribution model and a target surface polarization model of laser illumination,the coupling relationship between the polarization characteristics of three typical target materials and the divergence angle of a laser beam is analyzed.Backlight observation experiments are conducted in a controlled darkroom to verify the impact of the scattering angle of the laser beam on the polarization characteristics of the target.The experimental results show an 86.11%increase in target contrast for active polarization imaging under strong light background compared to traditional passive intensity imaging.Additionally,the visible polarization characteristics of different target materials vary with different divergence angles,and the line polarization of metallic materials is higher than that of non-metallic materials.The experimental results are in good agreement with the theoretical analysis.The outdoor solar backlight observation experiment verifies the applicability of the research method in high-intensity light and long-distance settings.This study can lay a theoretical foundation for improving accurate target perception under a strong light background.