三通道偏振成像系统及系统误差校正方法  

Three-channel Polarization Imaging Systems and System Error Correction Method

作　　者：季尔优[1] 顾国华[1] 柏连发[1] 钱惟贤[1] 

机构地区：[1]南京理工大学电光学院光电技术系,南京210094

出　　处：《光子学报》2014年第1期92-97,共6页Acta Photonica Sinica

基　　金：国家自然科学基金(No.61101199);江苏省自然科学基金(No.BK201199);南京理工大学自主科研重大研究计划(No.20112DJH22)资助

摘　　要：为了解决现有偏振成像系统难以满足目标检测和跟踪等实时图像处理领域的要求,提出一种实时三通道偏振成像系统,并对该系统存在的视场差异和非一致性误差提出了校正方法.该系统采用三个独立通道采集0°、60°和120°方向上的偏振图像,针对三个独立通道之间存在的视场差异提出了采用尺度不变特征转换配准法进行校正的方法;同时针对三个独立通道之间的灰度响应非一致性现象,根据积分球的退偏特性和探测器的线性响应模型,利用积分球产生完全非偏振光对灰度响应非一致性误差进行了校正.对比实验证明:1)本文提出的三通道偏振成像系统进行校正后的成像效果能够接近单通道偏振成像系统的水平;2)该系统能够在实时采集图像的同时,克服了多通道带来的偏振图像质量下降问题,提高了实用性.The existing polarization imaging systems are hard to meet the requirements of target detection and tracking in real-time image processing field. A three-channel polarization imaging system was put forward to solve above problems, and correction methods were proposed to solve the field differences and non-uniformity errors of the three-channel polarization imaging system. This system used three separate channels to acquire the polarization images from the direction of 0°, 60° and 120°. SIFT algorithm was used to solve the field differences among three independent channels. According to depolarization characteristics of the integrating sphere and linear response model of the detector, integrating sphere was used to produce unpolarized light to correcte the non-uniformity errors. Experimental results show that： 1） the imaging effect of the corrected three-channel polarization imaging system can be close to the level of single-polarization imaging systemrs; 2） the system can capture images real-time meanwhile overcome the quality-descent problem of the polarization images caused by multi-channel, improving the practical applicability.

关 键 词：偏振 误差校正 图像配准 视场差异 非一致性校正 退偏 实时系统 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]