1. An apparatus comprising: a capturing unit for capturing an input image of physical objects; a matching unit for matching a three-dimensional model to the physical objects; a processing unit for producing a modified partial image by at least one of: modifying a portion of the matched three-dimensional model, or modifying a partial image extracted from the input image using the matched three-dimensional model; and a display generator for generating signals representing an output image, the output image including the modified partial image superimposed over the input image.