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19 January 2001 Model for multispectral and panchromatic image fusion
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The Intensity Hue Saturation (IHS) transform is a widely used method to enhance the spatial resolution of multispectral images by substituting the Intensity component by the high resolution of the panchromatic image. However, such a direct substitution introduces important modifications on spectral properties. A more rigorous approach should consist in enhancing the spatial resolution of the intensity component through an appropriate combination with the panchromatic image. Such a combination is performed in the redundant wavelet domain by using a fusion model. SPOT images are used to illustrate the superiority of our approach compared to the IHS method for preserving spectral properties.
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Youcef Chibani and Amrane Houacine "Model for multispectral and panchromatic image fusion", Proc. SPIE 4170, Image and Signal Processing for Remote Sensing VI, (19 January 2001);

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