Keyphrases
- sparse coding
- dictionary learning
- natural images
- sparse representation
- linear combination
- image classification
- unsupervised learning
- generative model
- image representation
- discriminative power
- image patches
- person re identification
- sparse codes
- group sparsity
- high dimensional
- single image super resolution
- object category recognition
- deep belief networks
- machine learning
- feature space
- higher order
- high resolution
- visual words
- prior knowledge
- image processing
- data sets
- alternating optimization