Keyphrases
- sparse representation
- feature extraction
- image classification
- face recognition
- dictionary learning
- sparse coding
- dimensionality reduction
- extracted features
- feature selection
- feature space
- feature set
- joint optimization
- svm classifier
- compressed sensing
- image patches
- feature vectors
- negative matrix factorization
- signal processing
- compressive sensing
- image representation
- high dimensional data
- random projections
- principal component analysis
- linear discriminant analysis
- training data
- regularized least squares
- test images
- false positives
- training samples
- decision trees
- training set
- object tracking
- input data
- face images
- sparse reconstruction
- pattern recognition
- object detectors
- multiscale
- data sets
- sparse codes
- sparse approximations
- linear classifiers
- data points
- machine learning