Keyphrases
- sparse representation
- maximum likelihood estimation
- facial expression recognition
- face recognition
- facial expressions
- illumination variations
- maximum likelihood
- dictionary learning
- em algorithm
- human computer interaction
- sparse coding
- human faces
- image classification
- expectation maximization
- parameter estimation
- feature extraction
- probability distribution
- local binary pattern
- facial images
- signal processing
- face images
- image representation
- mixture model
- object tracking
- computer vision
- partial occlusion
- dimensionality reduction
- high dimensional data
- data mining
- feature points
- multi class
- image processing
- distance measure
- machine learning