Keyphrases
- sparse coding
- dictionary learning
- natural images
- sparse representation
- unsupervised learning
- linear combination
- image classification
- image representation
- discriminative power
- group sparsity
- generative model
- single image super resolution
- person re identification
- sparse codes
- image patches
- object category recognition
- feature space
- high dimensional
- visual words
- face recognition
- prior knowledge
- action recognition
- higher order
- object recognition