Keyphrases
- sparse representation
- signal processing
- dictionary learning
- sparse coding
- reconstruction error
- image classification
- image representation
- face recognition
- compressive sensing
- compressed sensing
- image patches
- joint optimization
- object tracking
- dimensionality reduction
- regularized least squares
- test images
- high dimensional data
- negative matrix factorization
- piecewise smooth
- high resolution images
- sparse approximations
- random projections
- unsupervised learning
- image features
- training set
- data analysis