1. An apparatus for generating mosaic images, comprising: an animation analyzer for outputting a motion vector of an input image; a coefficient calculator for calculating a transformation coefficient and a warping coefficient to generate a mosaic image on the basis of the motion vector, and outputting a currently transformed frame image; a means for offsetting illumination differences by detecting different illumination conditions between an already generated mosaic image up to date and the currently transformed frame image, offsetting an illumination difference based on the detection result and outputting a resultant image; and a mosaic image storage for storing a newly generated mosaic image and outputting to the means for offsetting illumination differences.