Keyphrases
- sparse coding
- dictionary learning
- natural images
- sparse representation
- image classification
- linear combination
- unsupervised learning
- image representation
- generative model
- discriminative power
- group sparsity
- sparse codes
- feature space
- person re identification
- visual words
- object category recognition
- image patches
- single image super resolution
- higher order
- input image
- small number
- probabilistic model
- active learning
- learning algorithm