1. A video object clipping method comprising: storing, in a storage unit, a plurality of original images each including a video object to be clipped and a plurality of reference alpha images representing a plurality of objects prepared; determining a criteria original image and a criteria reference alpha image from the original images and the reference alpha images; determining a deformation parameter by deforming the criteria reference alpha image to correspond to the criteria original image; and deforming remaining ones of the reference alpha images according to the determined deformation parameter to generate output alpha images corresponding to the original images.