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Table 2 The symbol table

From: Facial expression recognition using optimized active regions

Symbols Meanings
\(\theta\) The angle that need to rotate
I The set of subjects in JAFFE database
J The set of seven expressions
\(E_{ij}\) Image of the ith subject and the jth expression
C The set of classes of active regions
\(L_c\) The range of the active regions size of class c
\(bound_c\) The max size of active regions of class c
D The set of four directions
\(Dis^{cd}_{ij}\) The distance between the center of c and the limitation in direction d of \(E_{ij}\)
\(R^{cl}_{ij}\) The region of with size l
\(Hash^{cl}_i\) The sum of the distance among all c regions of subject i with a size of l
\(Sim^{cl}_i\) The similarity of c regions of subject i with a size of l
\(Sim^{cl}\) The similarity among c regions with size l