Image Fusion Techniques for Remote Sensed SPOT Images

The paper studies the effect of registration on fusion of remote sensed SPOT images. The SPOT-PAN and SPOT-XS images are registered using a wavelet-based multiresolution registration algorithm which is found to give sub pixel registration accuracy. The registered images are subjected to a pixel level multispectral image fusion process using wavelet transform approach. Spectral quality assessment shows that compared to other conventional fusion techniques, wavelet transform keeps much of the spectral information in the merged image with respect to the original multispectral one. Finally, segmentation performed on the fused images gives better segmentation accuracy for wavelet based method.