基于Mueller矩阵的偏振抑制反光方法  

Polarization Suppression Reflection Method Based on Mueller Matrix

作　　者：王佳林 段锦[1] 付强[2] 谢国芳 莫苏新 方瑞森 Wang Jialin;Duan Jin;Fu Qiang;Xie Guofang;Mo Suxin;Fang Ruisen(College of Electronic Information Engineering,Changchun University of Science and Technology,Changchun 130022,Jilin,China;National Defense Key Laboratory of Air-Ground Laser Communication Technology,Changchun University of Science and Technology,Changchun 130022,Jilin,China)

机构地区：[1]长春理工大学电信学院,吉林长春130022 [2]长春理工大学空地激光通信技术国防重点学科实验室,吉林长春130022

出　　处：《光学学报》2023年第20期154-166,共13页Acta Optica Sinica

摘　　要：针对利用主动光进行透窗探测所产生的反光问题,若仅依赖单偏振抑制反光,目标与背景之间对比度低,难以适用于强反射干扰下的目标透窗成像。而利用双偏振正交抑制反光,虽然对比度有所提高,但图像整体亮度较低,识别暗弱目标具有挑战性。本文以玻璃的镜面反光作为干扰对象,首先分析偏振抑制反光的能力,其次分析不同光源入射角下Mueller矩阵元素的变化规律,最后采用退偏图像来提高目标的显著性。结果表明,Mueller矩阵中M22和M33图像在灰度值的分布中明显不同于其他矩阵元素,通过M22和M33生成的退偏图像可有效区分目标与背景。该方法在保证图像整体亮度较高的同时,有效地提高了目标与背景之间的对比度,从而可应用于强反射干扰下的目标透窗成像以及暗弱目标的识别。Objective In real life,the targets behind the window need to be detected on many occasions.For example,when a natural disaster occurs,the targets inside trapped vehicles and boats should be identified,and it is also necessary for museums to filter out glass display cases of stray light and highlight the true appearance of exhibits.Additionally,the driving status of drivers should be accurately identified in road video surveillance,and in the fight against crimes,it is a necessity to accurately distinguish the location relationship between criminals and hostages behind the window.These occasions require a more reasonable target through-window detection method,and traditional target through-window detection methods have certain limitations in avoiding image degradation.The current research mostly adopts polarization image processing and image fusion methods to solve the image degradation,but these methods are not applicable in the light spot obscuring the target.When reflection interferes with target identification,single polarization suppression reflection is the most commonly employed polarization suppression reflection method.However,in the face of strong reflected light interference,the acquired image is overexposed and it is difficult to distinguish the target from the background.Utilizing double polarization suppression reflection can overcome the strong reflected light interference,and the contrast between the target and the background is improved with lower overall image brightness,and the recognition ability for dark and weak targets is poor in practical applications.Therefore,a more reasonable polarization suppression reflection method is necessary for active imaging,and it can be applied to target recognition under strong reflection interference and to the recognition of dark and weak targets.Finally,better image information for subsequent image processing can be provided.Methods The specular reflection of glass is used as the interference object.Firstly,we analyze the ability of polarization suppression

关 键 词：偏振抑制反光 透窗成像 MUELLER矩阵 退偏图像 

分 类 号：O436.3[机械工程—光学工程]