  In machine lip-reading, which is identification of speech from visual-only
information, there is evidence to show that visual speech is highly dependent
upon the speaker [1]. Here, we use a phoneme-clustering method to form new
phoneme-to-viseme maps for both individual and multiple speakers. We use these
maps to examine how similarly speakers talk visually. We conclude that broadly
speaking, speakers have the same repertoire of mouth gestures, where they
differ is in the use of the gestures.
