Keyphrases
- sparse representation
- face recognition
- dictionary learning
- sparse coding
- joint optimization
- image patches
- compressive sensing
- compressed sensing
- random projections
- face images
- image classification
- reconstruction error
- negative matrix factorization
- sparse approximations
- linear discriminant analysis
- dimensionality reduction
- subspace learning
- signal processing
- neural network
- piecewise smooth
- illumination variations
- principal component analysis
- high dimensional data
- object tracking
- face databases
- facial expressions
- test images
- image representation
- image segmentation
- face recognition systems
- computer vision
- sparsity constraints
- sparse codes