Keyphrases
- dictionary learning
- image set
- sparse representation
- face recognition
- face images
- sparse coding
- feature representation
- linear subspace
- feature vectors
- sparse representation based classification
- subspace learning
- image collections
- feature extraction
- discriminant analysis
- image matching
- principal component analysis
- facial expressions
- image representation
- image patches
- image classification
- learning algorithm
- natural images
- probabilistic model
- pairwise
- feature space
- image sequences