Fusion of multispectral and panchromatic images combining IHS and dual-tree complex wavelet

In order to decrease the spectral distortion using the IHS-based fusion method and more effectively inject the spatial detail information of high spatial resolution images into the fused image, this paper presents a new image fusion method that combines the IHS transform with dual-tree complex wavelet transform. The proposed method can overcome the distortion of spectrum. Firstly, intensity-hue-saturation (IHS) transform of multispectral(MS) image is implemented. Then panchromatic (PAN) image and the intensity component of MS images are decomposed into three scales using dual-tree complex wavelet transform respectively. After that, the region-based fusion operator is adopted to select the wavelet coefficients by fusing the wavelet coefficients of PAN image and the intensity component of MS at each scale in wavelet domain. Further, the fused intensity component is obtained by inverse dual-tree complex wavelet transform. Finally, the fused image is obtained by inverse IHS transform. The experiment results demonstrate our proposed method is effective.