the exaggeration is based on two relationships proposed by Redman : one is the relationship between different subjects’ features, and we define this relationship as inter process; the other is the relationship between facial features of the same subject ignored by previous works,
and we define it as intra process.


   The statistics-based synthesis module is divided into two parts: one is the exaggeration of feature shape points on x and y coordinates; and the other one is the exaggeration of feature position points on x and y coordinates. Both two parts further apply inter and intra processes. By inter and intra process we can automatically determine which features should be exaggerated. The exaggeration of feature position points is performed after the exaggeration of feature shape points.



As we have said above, an artist considers the difference not only from the average face but also other neighbor features of th e same subject. In other words, the major facial features of the subject are expected to be extracted, enhanced and then exaggerated in order to emphasize personal style of this face. As for other non-major facial features, the degree of exaggeration will decrease in order to enhance the contrast between the major features and the non-major features. For example, if the subject’s mouth is bigger than average mouth, but his/her nose is much bigger and rounder. Then the artist will draw the mouth smaller, but still bigger than average
mouth, to emphasize the variation of nose.

  After calculating all the variances of features, these variances are sorted to determine which shape exaggerative rate of feature should be increased and which one should be decreased.