Keyphrases
- sparse representation
- unsupervised feature selection
- negative matrix factorization
- dimensionality reduction
- norm minimization
- salient object detection
- dictionary learning
- sparse coding
- data clustering
- feature selection
- image classification
- face recognition
- image patches
- nonnegative matrix factorization
- image representation
- high dimensional data
- signal processing
- data mining applications
- pattern recognition
- multiscale
- high dimensionality
- training set
- principal component analysis
- data representation
- linear combination
- unsupervised learning