Keyphrases
- sparse codes
- sparse coding
- image classification
- dictionary learning
- sparse representation
- linear classifiers
- discriminative power
- image patches
- classification error
- linear combination
- multi class
- unsupervised learning
- pattern recognition
- natural images
- generative model
- data sets
- reconstruction error
- hyperplane
- image representation
- bag of words
- training samples
- prior knowledge
- feature vectors
- high dimensional
- support vector
- feature extraction
- image processing
- machine learning