Keyphrases
- sparse representation
- face recognition
- illumination variations
- image classification
- image representation
- test images
- illumination conditions
- illumination insensitive
- reconstruction error
- single image
- dictionary learning
- sparse coding
- piecewise smooth
- image features
- lighting conditions
- varying illumination
- image data
- input image
- image patches
- sparse coefficients
- subspace learning
- sparse reconstruction
- random projections
- compressed sensing
- multiscale
- signal processing
- face images
- image regions
- joint optimization
- image segmentation
- object tracking
- keypoints
- high resolution
- spatial information
- robust face recognition
- basis vectors
- face recognition algorithms
- compressive sensing
- nearest neighbor
- computer vision
- feature extraction
- training set
- image retrieval
- face recognition systems
- image matching
- high dimensional data
- human faces
- semi supervised
- principal component analysis
- face detection
- color constancy
- bag of words