C22. Filterbank-Enhanced IHS Transform Method for Satellite Image Fusion

Image fusion is a basic tool for combining low spatial resolution multi-spectral image and high spatial resolution panchromatic image using advanced image processing techniques. Many approaches have been developed to combine these images to obtain a fused one. Intensity-hue-saturation IHS transform is one of the widespread image fusion methods in the remote sensing community. However, this method introduces color distortion; therefore many papers have investigated modifications for the IHS method that can reduce this problem. In this paper, a filterbank-enhanced IHS method is developed for fusing satellite images. In this method a group of filters (a low pass filter, a high pass filter and several band pass filters) are used for filtering the panchromatic image and the intensity component of the original multispectral image. The resultant filtered images are combined to obtain a fused image. Experimental results indicate that filterbank-enhanced IHS method gives improved results relative to other fusion techniques.