Table 7. Confusion matrix of the proposed FER system that is trained on CK+ dataset and tested on JAFFE, MUG, USTC-NVIE, IMFDB, and AFEW datasets of facial expressions (Unit: %).

Expressions	Happy	Anger	Sad	Surprise	Fear	Disgust
Happy	83	3	4	4	4	2
Anger	3	84	6	3	4	0
Sad	1	3	88	4	1	3
Surprise	2	3	2	89	2	2
Fear	2	3	2	2	90	1
Disgust	3	3	4	3	3	84
Average	86.33