Activelets: Wavelets for sparse representation of hemodynamic responses.
Ildar KhalidovJalal FadiliFrançois LazeyrasDimitri Van De VilleMichael UnserPublished in: Signal Process. (2011)
Keyphrases
- sparse representation
- signal processing
- image representation
- dictionary learning
- sparse coding
- image classification
- multiresolution
- compressive sensing
- random projections
- face recognition
- image compression
- joint optimization
- dimensionality reduction
- compressed sensing
- wavelet transform
- reconstruction error
- image patches
- high dimensional data
- image processing
- test images
- sparse reconstruction
- feature extraction
- multiscale
- regularized least squares
- negative matrix factorization
- piecewise smooth
- sparse approximations
- pattern recognition
- machine learning
- image set
- data points
- image retrieval
- functional magnetic resonance imaging
- object recognition
- three dimensional
- norm minimization
- sparsity constraints
- neural network