Panchromatic and multi-spectral images fusion with multi-directional transform

In order to obtain high spatial resolution multi-spectral image, a multi-directional transform based remote sensing images fusion method is presented. Based on the imaging properties of panchromatic image and multi-spectral image, the fusion procedure is, first, multi-directional transform of panchromatic and multi-spectral image, so more high frequency components of both images can be obtained. And then, the combination of multi-directional high frequency coefficients of panchromatic image with low frequency coefficients of multi-spectral image, so more spatial and spectral information will be preserved. Finally, a high spatial resolution multi-spectral image can be obtained after inverse multi-directional transform. Preliminary experiment results show that the fused multi-spectral image has very good spatial resolution and spectral characteristic. The multi-directional transform based fusion method is better than wavelet transform based fusion method.