Quantification of Facial Movements of Healthy Individuals Using Viola-Jones and Otsu

Abstract

The symmetry of the human face plays an important role in the activities of the individual's daily life. On the other hand, the asymmetry of the face can be synonymous with diseases in the individual, some manifest at rest and others in movement. In this work we quantify four of the movements of the human face. The quantified movements are lifting eyebrows, closing eyes, smiling and kissing. We identify the tracking points (PS), with Viola-Jones and Otsu, within the thirds or fifths of the face, dependent on the movement. We extract the face at rest, which we use as a reference, it is parametrized to segment the face where the facial movement develops. We locate the maximum displacements (MD), depending on the thirds or fifths, of the PS for each movement. The quantification is determined by the average MD of the PS for the execution of 10 repetitions of a facial movement. We present results from a group of 12 healthy individuals. The maximum average displacements are 30% for eyebrows within the first third, 20% for smile in the second and fourth fifth in the third third, 30% for the kiss between the second, third and fourth fifth of the third third; and the 12 individuals manage to close their eyes and it develops in the second and fourth fifth within the second third.