Keyphrases
- sparse representation
- color images
- sparse coding
- dictionary learning
- color information
- image classification
- reconstruction error
- face recognition
- image processing
- random projections
- object tracking
- image representation
- regularized least squares
- negative matrix factorization
- compressed sensing
- image patches
- discriminative power
- sparse approximations
- signal processing
- test images
- sparse codes
- dimensionality reduction
- compressive sensing
- norm minimization
- joint optimization
- piecewise smooth
- sparse coefficients
- sparse reconstruction
- sparsity constraints
- robust face recognition
- pattern recognition
- small number
- linear combination
- high dimensional data
- visual words
- computer vision
- data analysis
- machine learning