Multi Focus Image Fusion Based on Spline Pyramidal Direction Filter Banks

Contourlet transform is a powerful analysis tool of image which has lines and hyper-plane singularity. It uses Laplacian pyramid transform to decompose source images. But the loss of information of Laplacian pyramid is large than that of the difference pyramid constructed from spline pyramid. In this paper, we use spline pyramid transform to get a multi scale decomposition tree, construct the different pyramid which is similar to Laplacian pyramid, combine the different pyramid and directional filter bank to get a novel multi scale and multi directional decomposition. Finally, this novel transform is applied to image fusion. Experiments show that it has better performance than the image fusion schemes based on contourlet transform.