基于偏振信息的遥感图像大气散射校正

Polarization Method for Atmospheric Scattering Correction of Remote Sensing Image

大气散射严重影响了航空遥感图像的质量。为了提高航空遥感图像的识别能力,提出一种基于偏振信息的航空遥感图像大气散射校正方法。大气散射具有显著的偏振特性,而对于垂直探测的地物辐射信号偏振度非常低,该方法正是利用大气散射偏振特性与地物目标偏振特性的差别,从图像中提取地物目标辐射信息,从而提高遥感图像的质量。通过机载多波段偏振CCD相机获取航空偏振遥感图像数据,并采用一组443 nm波段的航空偏振图像数据进行图像大气散射校正实验,实验结果表明该方法能有效地进行航空遥感图像的大气散射校正,从而提高了航空遥感图像的识别能力。

Atmospheric scattering degrades the aerial remote sensing images. To improve the quality of the remote sensing image, a correction method of aerial remote sensing images using polarization information is presented. Atmospheric scattering light has distinct polarization characteristic, but the degree of polarization of vertical object radiance is very small. Object radiance is extracted from image information based on the different polarization characteristics between airlight and object radiance. The polarization images can be obtained by airborne muff-band Polarization CCD Camera. Experiment of image correction was carried out with polarized images in 443 nm, and the experimental result shows this method is very effective on correction of aerial remote sensing images.