基于偏振特征的水面饱和耀光抑制技术  

Suppression Technology for Saturated Water Surface Glint Based on Polarization Characteristics

作　　者：张景华 张焱[1] 石志广[1] 李飚[1] 张宇[1] 凌峰 张毅[1] 刘荻 Zhang Jinghua;Zhang Yan;Shi Zhiguang;Li Biao;Zhang Yu;Ling Feng;Zhang Yi;Liu Di(National Key Laboratory of Science and Technology on Automatic Target Recognition,College of Electronic Science and Technology,National University of Defense Technology,Changsha 410073,Hunan,China)

机构地区：[1]国防科技大学电子科学学院ATR重点实验室,湖南长沙410073

出　　处：《光学学报》2022年第24期73-82,共10页Acta Optica Sinica

基　　金：国家自然科学基金(62075239,61302145);武器装备预研项目(9140C800302KG01)。

摘　　要：为解决水面及水下目标侦察、探测、识别过程中存在的水面耀光干扰问题,利用偏振特征实现了水面耀光的抑制和目标的增强。分析了水面光波反射和折射过程中偏振特征传输规律,利用光波在垂直方向和平行方向上的光强分布关系,提出一种基于偏振反折射效应的水面耀光抑制方法。该方法利用水面反射偏振度、折射偏振度、垂直方向光强图像和平行方向光强图像,实现了水面耀光的分离和抑制。针对饱和耀光抑制过程中存在的垂直方向光强图像饱和失真问题,提出了一种基于完全偏振分解的饱和光强恢复方法,利用平行方向光强图像和任意一个非饱和起偏方向上获取的光强图像计算恢复出垂直方向光强图像,然后利用恢复后的垂直方向光强图像实现水面饱和耀光的抑制。实验结果表明,通过对水面耀光的抑制,有效提升了耀光区域内目标和背景之间的对比度及信噪比,增强了目标的显著性。To solve water surface glint interference problem in the reconnaissance,detection,and recognition of water surface and underwater targets,this paper uses polarization characteristics to suppress water surface glint and enhance targets.For this purpose,the propagation laws of the polarization characteristics of light waves during the reflection and refraction of such waves at the water surface are analyzed.According to the relationship between the intensity distributions of light waves in perpendicular and parallel directions,this paper proposes a suppression method for water surface glint based on the reflection and refraction polarization effects.This method achieves the separation and suppression of water surface glint by using the degree of reflection polarization,the degree of refraction polarization,the perpendicular light intensity image,and the parallel light intensity image.A saturated light intensity restoration method based on complete polarization decomposition is proposed to address the problem of saturation distortion of the perpendicular light intensity image in the suppression of saturated glint.The perpendicular light intensity image can be calculated and restored with the parallel light intensity image and the light intensity image obtained in any unsaturated polarizing direction.Then,the restored perpendicular light intensity image can be used to suppress the saturated water surface glint.The experimental results show that the suppression of the water surface glint effectively increases both the contrast and the signal-to-noise ratio between the target and the background in the glint area and thereby enhances the prominence of the target.

关 键 词：海洋光学 偏振特征 完全偏振分解 水面耀光抑制 饱和图像恢复 目标增强 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]