US Patent 8396708 Facial expression representation apparatus

An avatar facial expression representation technology is provided. The avatar facial expression representation technology estimates changes in emotion and emphasis in a user's voice from vocal information, and changes in mouth shape of the user from pronunciation information of the voice. The avatar facial expression technology tracks a user's facial movements and changes in facial expression from image information and may represent avatar facial expressions based on the result of the these operations. Accordingly, the avatar facial expressions can be obtained which are similar to actual facial expressions of the user.