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Table 1 Salient facial patches under different head poses

From: Non-frontal facial expression recognition based on salient facial patches

Head pose

Salient facial patches

Number of patches

90°

P1, P2, P3, P7, P8, P9, P10, P14, P16, P17, P18, P20

12

45°

P1, P2, P3, P7, P8, P9, P10, P14, P16, P17, P18, P20

12

P1–P20

20

− 45°

P4, P5, P6, P10, P11, P12, P13, P15, P16, P17, P19, P20

12

− 90°

P4, P5, P6, P10, P11, P12, P13, P15, P16, P17, P19, P20

12