遥感影像融合与辐射校正顺序关系探讨
Study on order relation between image fusion and radiometric correction of remote sensing images

以Landsat-7 ETM+、 SPOT-5、 IKONOS和EO-1 ALI 四种遥感影像为数据源，采用多种辐射校正模型和Pansharp融合算法对遥感影像融合和辐射校正先后关系进行探讨，并利用GVI、 ERGAS和CC 三个评价指标对获得融合后影像从光谱保真度和高频信息融入度两个方面进行定量评价. 实验表明，影像融合与辐射校正的先后顺序对所获得融合影像高频信息融入度无影响，但易引起光谱保真度差异.
With remote sensing images of Landsat-7 ETM+，SPOT-5，IKONOS and EO-1 ALI as test datum，the five models of radiometric correction and Pansharp algorithm have been used to study on the relationship between image fusion and radiometric correction. The ability of gaining high frequency information and the spectral fidelity were assessed by using visual and statistical analysis. The statistical methods include ERGAS，GVI and CC. The result shows that the high frequency information gained of the fusion images are the same regardless they are radiometrically corrected before or after fusion，and the spectral fidelity is related to the order between image fusion and radiometric correction