Keyphrases
- sparse representation
- regularized least squares
- dictionary learning
- sparse coding
- image classification
- face recognition
- joint optimization
- negative matrix factorization
- kernel function
- signal processing
- kernel methods
- compressed sensing
- image patches
- random projections
- image representation
- compressive sensing
- dimensionality reduction
- reconstruction error
- support vector
- sparse approximations
- sparse reconstruction
- test images
- kernel matrix
- feature space
- high dimensional data
- object recognition
- linear classifiers
- multiple kernel learning
- super resolution
- sparse learning
- image processing
- data sets