A remote-sensing image fusion based on wavelet transform

A new remote sensing image fusion method based on wavelet transform has been devised for the construction of fusion multi-spectral images.The method utilizes the gradient filter given in matrix form and an improvement of the fusion algorithm proposed by Petrovic,and was applied to the fusion of Landsat Enhanced Thematic Mapper(ETM) images.The resulting images are superior to the original ETM images and gray fusion images.The method not only affords significant enhancement of spatial detail information,but also preserves the spectral information of the original multi-spectral image well.