Keyphrases
- facial expression recognition
- sparse representation
- face recognition
- facial expressions
- dictionary learning
- human computer interaction
- sparse coding
- expression recognition
- image classification
- feature extraction
- human faces
- local binary pattern
- signal processing
- compressive sensing
- expression classification
- dimensionality reduction
- gabor features
- image representation
- object tracking
- subspace learning
- active appearance models
- high dimensional data
- image patches
- data sets
- data analysis
- facial features
- face detection
- facial images
- principal component analysis
- illumination variations
- machine learning
- input image
- pattern recognition
- video sequences
- high quality
- feature selection
- natural images
- computer vision
- feature points
- face images