Evaluation and Analysis on Image Fusion of ETM
ETM影像融合的评价分析

In this paper,five image fusion algorithms including HIS transformation,Brovey transformation,Weighting fusion,SFIM transformation and ISVR transformation are experimented between Landsat-7 ETM PAN band and multi-spectral bands.The result of different fusion methods is evaluated qualitatively and quantitatively by comparing the spectral fidelity and the spatial resolution.The study indicates that HIS transformation distorts the spectral quality most seriously.Brovey transformation is not very nice both in retaining the spectral quality and improving the spatial resolution.The result of Weighting fusion depends on the weighting seriously.Smoothing Filter-Based Intensity Modulation(SFIM) distorts the spectral quality greatly,however,it can not improve the spatial resolution.Improved Synthetic Variable Ratio(ISVR) is very fit for fusion with ETM images on the who1e.ISVR technique distorts the spectral quality slightly,as well as improves the spatial resolution obviously.The advantage is that it considers the relation of panchromatic band and multispectral bands,which is ignored by other methods in this paper.