A novel image fusion scheme is proposed based on the soft mathematical morphology.First,this scheme performs a multi-scale soft morphological open-close filter to get the low-frequency smooth images for the source images.Second,the multi-scale soft top-hat and bottom-hat transforms are applied to extract the image detail features smaller than the current scale.Finally,an image fusion is performed for the low-frequency smooth images and the multi-scale high-frequency detail images.The fused image is formed w...