An Integrated Model for On-Site Teaching Quality Evaluation Based on Deep Learning

Table 2

Facial expressions and facial features.

Facial expressions	Facial features
Disgust	Snort, upper lip up, eyebrows drooping, and squinting
Upset	Eyebrows droop, forehead tightly wrinkled, eyelids, and lips strained
Sadness	Squint, eyebrows tighten, corners of the mouth pull down, chin up, or tighten
Fear	The mouth and eyes are open, eyebrows are raised, and nostrils are open
Neutrality	The face is calm and relaxed
Happiness	The corners of the mouth are cocked, the cheeks are raised and wrinkled, the eyelids are contracted, and the tail of the eyes will form “crow’s feet”
Surprise	The jaw droops, the lips and mouth relax, the eyes are open, and the eyelids and eyebrows are slightly raised