1. A digital refocusing method, comprising: obtaining a plurality of images corresponding to multiple views in a scene, wherein the images comprise a central view image and at least one non-central view image; obtaining a disparity map corresponding to the central view image; performing a pixel shift or a pixel index shift to the non-central view image; performing a line scan along a pre-determined linear path to the central view image and the non-central view image to obtain corresponding pixels of the central view image and corresponding pixels of the non-central view image; performing view interpolation based on disparities defined in the disparity map, obtaining target pixels from the corresponding pixels of the central view image and the corresponding pixels of the non-central view image according to a target disparity, wherein the target pixels are corresponded to a novel view; and obtaining a refocused novel view image by averaging and compositing the target pixels from a plurality of novel views; wherein the view interpolation comprises: obtaining a temporary pixel by mapping the corresponding pixels of the central view to the novel view according to the target disparity; if there is only one target pixel of the novel view between one of the two neighboring temporary pixels, the target pixel is derived by performing linear interpolation on the two temporary pixels; if some pixel of the central view is occluded in the novel view, the target pixels are derived by directly mapping the corresponding pixels of the non-central view to the novel view using an estimated disparity which is the closest available one on the disparity map.