An improved image fusion scheme based on àtrous wavelet transform is proposed.Firstly,multispectral image is transformed by IHS.Secondly,panchromatic image is transformed by a trous wavelet transform.Then,features are extracted from the PAN image in order to integrate into the initial intensity component.In order to control the amount of PAN features that are integrated into multispectral images,a normalized importance measure is derived from the wavelet coefficients to select the significant PA...