Keyphrases
- sparse representation
- dictionary learning
- sparse coding
- image classification
- compressive sensing
- face recognition
- learned dictionary
- joint optimization
- random projections
- image patches
- negative matrix factorization
- regularized least squares
- compressed sensing
- image representation
- dimensionality reduction
- signal processing
- piecewise smooth
- test images
- sparse approximations
- high dimensional data
- sparsity constraints
- reconstruction error
- high resolution
- super resolution
- natural images
- norm minimization
- sparse reconstruction
- data sets