Keyphrases
- sparse representation
- dictionary learning
- sparse coding
- image classification
- face recognition
- reconstruction error
- image representation
- compressive sensing
- signal processing
- object tracking
- image patches
- joint optimization
- test images
- random projections
- high dimensional data
- compressed sensing
- hierarchical bayesian
- sparsity constraints
- neural network
- sparse approximations
- negative matrix factorization
- regularized least squares
- sparse reconstruction
- image processing
- dimensionality reduction
- feature extraction
- sparse codes
- piecewise smooth
- object recognition