Recognition of facial expressions - Knowledge Based Systems ...

There is another kind of structure (Listing 13) used for computing the probability of a
parameter being in a certain state, given the state of presence/absence of the Action Unit
parameters.
//-------------------------
1: struct cere2
2: {
3: int AU[10][2];
4: int n;
5: int P[2];
6: cere2():n(0){}
7: void empty(void){n=0;}
8: void setP(int k,int clasa){P[0]=k;P[1]=clasa;}
9: void add(int au,int activ){AU[n][0]=au;AU[n][1]=activ;n++;}
10: };
//-------------------------
Listing 13. A query for computing the CPTs for the first level
The sources of all the routines can be consulted in the appendix section.
Facial expression recognition application
As a practical application for the current project, a system for facial expression
recognition has been developed. Basically, it handles a stream of images gathered from a
video camera and further applies recognition on very frame. Finally, it provides as result
a graph with the variances of the six basic emotions of the individual in a time domain.
The figure below offers an overview on the functionality of the designed system.
- 79 -