摘要
同时偏振成像探测技术是一种新型的偏振成像探测技术,它能在同一个探测器上同时获得被探测目标0°、45°、90°、135°4个偏振方向的偏振强度图像。为了准确获取被探测目标的偏振信息,这4幅图像的配准显得尤为重要。为了使配准精度达到0.1个像元,结合同时偏振成像探测系统的成像方式,提出了一种基于空域和频域互相关的偏振图像配准方法。该方法使用硬件和软件相结合的方式完成图像的配准。首先使用空域互相关的算法实现图像的像元级粗配准;然后使用频域互相关的像元级配准算法进行像元级精配准;最后使用频域互相关的亚像元配准算法实现偏振图像的亚像元级配准。
Detection technology of imaging polarization has potential applications in target detection and remote sensing, with this technology the polarization state of light emitted from and/or reflected from scene can be measured. Simultaneous Imaging Polarization （SIP） is a new imaging polarization technology, which can avoid false polarization effects in time-sequential polarization detection system caused by the motion of the platform or target. The detection system can simultaneously obtain polarization intensity images of the same target among 0°, 45°, 90° and 135° on the same detector. Consequently, there is mis-registration among these four images, though the registration parameters are constant after the system is assembled. So, in order to obtain accurate polarization information of the detected target, registration accuracy of four images must reach 0.1 pixel. The polarization image registration method which was based on the spatial and frequency domain cross-correlation was presented. Firstly, pretreatment of these four images was prepared for image registration. Secondly, cross- correlation in achieve the pixel level of image registration. At last, cross-correlation in achieve the sub-pixel level image registration. In order many experiments have been done and
出处
《红外与激光工程》
EI
CSCD
北大核心
2013年第1期262-267,共6页
Infrared and Laser Engineering
基金
中国科学院知识创新工程青年人才领域前沿基金(073H9a1141)
关键词
偏振图像配准
亚像元
互相关
傅里叶变换
polarization image spatial domain was used to frequency-domain was used to to validate the accuracy of this registration method, its registration accuracy can meet this SIP system＇s requirement. registration
sub-pixel
cross-correlation
Fourier transform
