Keyphrases
- sparse representation
- lower order
- higher order
- high order
- median filter
- color images
- image classification
- face recognition
- image patches
- computational complexity
- linear classifiers
- objective function
- fourth order
- image representation
- signal processing
- dimensionality reduction
- natural images
- covariance matrix
- gaussian noise
- noise reduction
- high dimensional data
- error rate
- data sets
- pairwise
- computer vision
- neural network