Rule based assessment of hearing-impaired children's facial expressions

In this study, the facial data of the adults and the hearing-impaired children have been analysed and compared by rule-based facial expression recognition methods. 68 face points have been selected for calculation. Then using these points, the angle between the upper and down lips, the length of the corner of the lip, the angle between the eyebrows and the nose, and the angle of the aperture of the eye have been calculated. In these children, the positive facial expression can be comprehended by the lip's data and for the negative facial expression it has been determined that eyebrows, eyes and the lips should be included in the evaluation, as well. In addition to that, it has been stated that, a threshold value for these face features can not be determined within a rule based system but they can be used to determine the transitions of facial expression between different images of the same child.