Multiresolution wavelet decomposition to merge Landsat TM and SPOT panchromatic data

A new algorithm is developed to merge a high-resolution panchromatic image and a low-resolution multi-spectral image based on the combination of multi-resolution wavelet decomposition and the IHS (intensity-hue-saturation) transform. The high-resolution panchromatic image is firstly decomposed to the wavelet planes, then the region is divided by edge information from the wavelet planes and the intensity component from the multispectral image is merged by a fusion operator in different regions. The proposed method is compared with the IHS and the MWT (multiresolution wavelet transform) methods. The experimental results show that the proposed method can achieve better fusion performance in combining and preserving spectral-spatial information.