1. A method of processing two or more images to distinguish a head in the images from other portions of the images, comprising the following actions: predicting portions of the images that form facial portions of the images; calculating one or more skin colors by sampling the images at the predicted portions; computing a first mask image that marks any image pixels whose colors are different in the two or more images; creating a second mask image that marks any image pixels whose colors correspond to the calculated one or more skin colors; combining the first and second mask images to create a final mask image.