Keyphrases
- sparse representation
- sparse codes
- dictionary learning
- sparse coding
- linear classifiers
- image classification
- compressive sensing
- face recognition
- discriminative power
- sparse approximations
- compressed sensing
- image patches
- high dimensional data
- signal processing
- sparse reconstruction
- training data
- joint optimization
- decision trees
- feature selection
- feature space
- subspace learning
- image representation
- support vector machine
- test images
- negative matrix factorization
- random projections
- svm classifier
- regularized least squares
- feature extraction
- dimensionality reduction
- histograms of oriented gradients
- image segmentation
- unsupervised learning
- multi class
- multiscale
- hyperplane
- pattern recognition
- training set
- neural network