摘要
对于核心部件为线阵CCD阵列的航空高光谱成像仪而言,积分时间因随飞行过程中成像行频动态变化而变化,导致影像中各行数据记录的地物灰度值不具备可比性,更使得相邻航带可能出现明显色差。为此,发展了一种基于行频变化的相对辐射校正方法,在传统的相对辐射校正模型中引入了行频的影响,实现了反映行频动态变化的航空高光谱数据辐射校正三维曲面模型。通过无人机载高光谱成像仪的航空飞行试验,利用所获取的验证场的图像进行相对辐射校正处理,通过相邻航带间图像处理前后色差比较、验证场布设均匀靶标的定量化处理结果分析,证明了所发展的相对辐射校正模型不仅可以很好地校正图像的非均一性,而且可有效地克服由于行频差异引起的相邻航带间色差。
According to the feature of line frequency changed with aircraft altitude and speed for the airborne hyperspectral imager based on line array CCD,the output DN would be different under the same conditions of incident radiation.Therefore there would not have comparability between each line ground objects of images,especially there would be color difference between adjacent strips.A relative radiometric correction model based on line frequency difference was developed.By introducing the effect of line frequency difference to the traditional relative radiometric correction model,a three-dimensional surface reflecting the effect of line frequency difference for relative radiometric correction of airborne hyperspectral data was obtained.The verification field images obtained from a UAV hyperspectral imager was processed for comparing the color difference of adjacent strips and analyzing the corrected uniform targets,the results show that the non-uniformity of images has been corrected well and the deviation by line frequency difference has been conquered.
出处
《遥感技术与应用》
CSCD
北大核心
2012年第1期33-38,共6页
Remote Sensing Technology and Application
基金
国家863计划项目"数据处理与科学分析系统技术研究"(2008AA121805)
关键词
航空高光谱成像仪
相对辐射校正
行频
积分时间
Airborne hyperspectral imager
Relative radiometric correction
Line frequency
Integration time
