可见光偏振成像系统对低对比度目标的探测

Low Contrast Target Detection Based on Visible Light Polarization Imaging System

为实现低对比度、复杂背景下隐蔽目标的探测,搭建了双液晶相位可变延迟器(LCVR)的分时全偏振成像系统,提出了基于最小2-范数条件数的系统中2个LCVR相位延迟量控制的最优化组合方案。为探测隐蔽目标的真实偏振状态,在该组合方案设置下标定得到了系统仪器矩阵,并对隐藏于树阴下的绿色涂层目标进行了野外成像实验。实验结果表明,普通强度图像中目标与背景的对比度几乎为零,而经反演得到的S0图像中目标与背景对比度为0.2525,结果进一步证明,该分时偏振成像系统可以有效地实现复杂背景下低对比度目标的探测。

In order to detect the low contrast targets in the complicated background, the time division full polarization imaging system based on dual liquid crystal variable retarders （LCVR） is developed, and an optimum combination scheme based on the minimum 2-norm is proposed in the control of LCVR phase retardation. The system instrument matrix is calibrated with the optimum phase retardation combination, and the field imaging experiment is carried out when the green coating targets are hidden in the shade. The experimental result shows that the contrast between the target and its background is almost zero in the ordinary intensity image and 0. 2525 in the So image obtained by inversion. The achieved result further proves that the system can effectively realize low-contrast target detection in complex background.