Keyphrases
- sparse coding
- dictionary learning
- natural images
- sparse representation
- image classification
- linear combination
- unsupervised learning
- discriminative power
- generative model
- group sparsity
- image representation
- single image super resolution
- feature space
- object category recognition
- person re identification
- sparse codes
- image patches
- sparsity constraints
- high dimensional
- high quality
- visual words
- signal processing
- pattern recognition
- dimensionality reduction
- input image
- probabilistic model
- multiscale
- training data
- alternating optimization