Keyphrases
- dictionary learning
- sparse representation
- norm minimization
- sparse coding
- image classification
- object category recognition
- image super resolution
- face recognition
- image patches
- group sparsity
- dimensionality reduction
- sparse codes
- signal processing
- regularization term
- feature extraction
- image representation
- unsupervised learning
- objective function
- natural images
- high quality
- dictionary learning for sparse