Abstract
A facial expression recognition system includes a facial database, an image capture unit, an expression recognition data generation unit and an expression recognition unit. The facial database includes a plurality of expression information and variations in optical flow, wherein each of the variations in optical flow corresponds to one of the expression information. The image capture unit captures a plurality of facial images. The expression recognition data generation unit is coupled to the image capture unit and the facial database for receiving a first facial image and a second facial image from the image capture unit and calculating a variation feature in optical flow between the first facial image and the second facial image corresponding to each of the expression information. The expression recognition unit is coupled to the expression recognition data generation unit for determining a facial expression corresponding to the facial images according to the calculated variation feature in optical flow for each expression information and the variation features in optical flow within the facial database.