Keyphrases
- sparse coding
- dictionary learning
- sparse representation
- natural images
- linear combination
- image classification
- image representation
- unsupervised learning
- discriminative power
- generative model
- single image super resolution
- group sparsity
- sparse codes
- image patches
- object category recognition
- feature space
- visual words
- sparsity constraints
- multiscale
- data sets
- bag of words
- dimensionality reduction
- object recognition
- expectation maximization
- low dimensional
- test images
- nearest neighbor
- probabilistic model
- high dimensional
- visual recognition