  In an appropriate image fusion method, spatial information of the
panchromatic image is injected into the multispectral images such that the
spectral information is not distorted. The high-pass modulation method is a
successful method in image fusion. However, the main drawback of this method is
that this technique uses the boxcar filter to extract the high frequency
information of the panchromatic image. Using the boxcar filter introduces the
ringing effect into the fused image. To cope with this problem, we use the
wavelet transform instead of boxcar filters. Then, the results of the proposed
method and those of other methods such as, Brovey, IHS, and PCA ones are
compared. Experiments show the superiority of the proposed method in terms of
correlation coefficient and mutual information.
