Combining Laplacian Transform and Image Gradient for Focal Stack Image Fusion

A photo sequence captured with different focal settings is called a focal stack image. By merging the focal stack image we can obtain an all-in-focus image. A merging strategy is introduced in the image fusion process with spatial image transform. A fusion selective function is formed using Laplacian transform and image gradient based on the focal stack photography. Two other methods in spatial domain are compared as well as the proposed method.