Recognition of facial expressions - Knowledge Based Systems ...
Recognition of facial expressions - Knowledge Based Systems ...
Recognition of facial expressions - Knowledge Based Systems ...
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
-------------------------<br />
1: struct file<br />
2: {<br />
3: int nsubj;<br />
4: int nscene;<br />
5: FACS facs;<br />
6: char expr[100];<br />
7: float param[50];<br />
8: };<br />
//-------------------------<br />
Listing 10. Data structure to store the information related to one sample<br />
Each Action Unit sequence is handled separately by using a structure that is defined in<br />
Listing 11. It also contains some routines for easily converting from a character structure,<br />
to efficiently copy data from another similar structure and to check for the existence <strong>of</strong><br />
some condition.<br />
//-------------------------<br />
1: struct FACS<br />
2: {<br />
3: int n;<br />
4: unsigned char a[30][3];<br />
5: void assign(char*);<br />
6: void copyFrom(FACS&);<br />
7: void show(void);<br />
8: bool Is(int,int);<br />
9: bool containAU(int);<br />
10: };<br />
//-------------------------<br />
Listing 11. The internal structure to handle the AU sequence <strong>of</strong> one sample<br />
A query is encoded in a structure that is shown in<br />
Listing 12. It can be used for computing the probability <strong>of</strong> any expression, given the state<br />
<strong>of</strong> existence/absence <strong>of</strong> the Aus from the set.<br />
//-------------------------<br />
1: #define MAXQUERYLEN 50<br />
2: struct query<br />
3: {<br />
4: char expr[100];<br />
5: bool swexpr;<br />
6: bool neg_expr;<br />
7: bool neg[MAXQUERYLEN];<br />
8: FACS f[MAXQUERYLEN];<br />
9: int n;<br />
10:<br />
11: query():n(0),swexpr(false),neg_expr(false){};<br />
12: bool add(char*e,bool sw_n=true);<br />
13: void empty(void){n=0;neg_expr=false;swexpr=false;}<br />
14: };<br />
//-------------------------<br />
Listing 12. The structure <strong>of</strong> a query<br />
- 78 -