1. A method of processing video data captured by a handheld mobile video data capture device, said video data comprising a plurality of sets of frame data, said method comprising: (a) finding a face in each frame of said video; and (b) processing a corresponding set of frame data of the video data captured by the handheld mobile capture device to: (i) maintain the area of the image occupied by said face substantially constant; and (ii) maintain the apparent direction of light incident upon said face substantially constant; and (iii) maintain the apparent color of said face substantially constant.