Adaptive fusion of ETM+Landsat imagery in the Fourier domain

This work proposes a new methodology for fusing multispectral images, based on the a tailored filtering in the Fourier domain. FIR (Finite-duration Impulse Response) filters have been designed to fuse the high and low frequencies information contained in a high spatial resolution image (PAN ) and in a multispectral image (MULTI), respectively. An objective criterion, which depends only on source images characteristics, has been established for determining the order and the cut-off frequency of the FIR filters. The proposed method has been tested with ETM+ images, and its performances have been compared with those of Wavelet and IHS. From obtained results, it can be concluded, that the fused images by the proposed method are characterized by a high spatial and spectral quality.