Abstract: An image fusion method based on nonsubsampled contourlet transform(NSCT)is presented,which uses the nonsubsampled pyramids(NSP)and the nonsubsampled directional filter banks(NSDFBs)to decompose the source images in a multi-scale and multi-direction way.Like the contourlet transform method,the presented method can obtain multi-scale and multi-direction images with good multi-resolutions,and it is also shift-invariant.In the fusion process,an improved consistency check strategy is used.The high frequency coefficients are checked not only in their own level but also in all high frequency levels.The experimental results show that the presented fusion method is effective,and it can obtain better fused images than such methods as Laplacian pyramid transform,wavelet transform and contourlet transform with respect to several indicators.