基于ETM+遥感图像的图像融合试验及评价方法

为了对比分析不同方法在融合ETM+遥感图像的高空间分辨率全色波段和多光谱波段的效果,选取基于彩色技术的IHS和RGB变换、基于图像变换技术的PC变换、Gram-schmidt变换和基于算数技术的Brovey变换4种融合方法,对研究区域ETM+图像进行了融合,并采用衡量信息量的信息熵、标准差及衡量光谱保真能力的偏差指数和相关系数进行了融合效果评价。融合结果表明:依Brovey、IHS、PC、Gram-Schmit方法融合后的图像,其光谱保真程度逐渐降低。Brovey变换最大限度保持了原始图像的光谱信息,而空间信息的详细程度较差;IHS变换空间融合后的图像空间细节信息最大,但光谱保真能力差;PC变换和Gram-schmidt变换后融合图像的光谱保真和空间信息详细程度介于Brovey和IHS之间;Brovey和IHS有较好的融合效果。

Trial of image fusion methods and quality assessment for ETM+image

In order to evaluate different fusion methods in merging pan band and multispectral band for ETM+ image,fusion methods such as color based technique,nominal technique and image transformation were used and tested.For the quality assessment of fusion methods,quantitative analysis was done using the following criteria: standard variation,information entropy,bias index,correlation coefficient. The result showed that there was an obvious improvement of the spatial resolution for all fusion methods.For the spect...