Keyphrases
- quality evaluation
- classroom teaching
- facial features
- online learning
- facial feature extraction
- facial expression recognition
- human perception
- evaluation model
- face images
- facial expressions
- quality metrics
- feature extraction
- feature points
- expression recognition
- face identification
- face detection
- object recognition
- activity recognition
- real time
- action recognition
- three dimensional
- high school
- learning strategies
- facial feature points
- human computer interaction