Keyphrases
- sparse coding
- matching pursuit
- basis functions
- linear combination
- image coding
- natural images
- sparse representation
- dictionary learning
- image classification
- discriminative power
- unsupervised learning
- generative model
- image representation
- feature space
- road signs
- higher order
- image patches
- multiscale
- high dimensional
- deep belief networks
- sparse approximation
- filter bank
- bag of words
- wavelet transform
- object recognition
- pattern recognition