Keyphrases
- action recognition
- sparse coding
- bag of words
- visual words
- dictionary learning
- sparse representation
- natural images
- image classification
- human actions
- linear combination
- unsupervised learning
- human detection
- generative model
- image representation
- computer vision
- image patches
- high dimensional
- bag of visual words
- feature space
- bag of features
- model selection
- signal processing
- small number
- image retrieval
- multi camera
- pattern recognition
- feature extraction
- scene classification
- face recognition