Group sparsity with orthogonal dictionary and nonconvex regularization for exact MRI reconstruction.
Shujun LiuJianxin CaoHongqing LiuXiao-heng TanXichuan ZhouPublished in: Inf. Sci. (2018)
Keyphrases
- group sparsity
- sparse representation
- structured sparsity
- compressive sensing
- dictionary learning
- sparse coding
- low rank
- high resolution
- convex optimization
- discriminative power
- image reconstruction
- face recognition
- image representation
- random projections
- high dimensional data
- image classification
- group lasso
- learning problems
- image patches
- optimization problems
- semi supervised
- super resolution
- feature extraction
- dimensionality reduction
- signal processing
- unsupervised learning
- test images
- multiscale
- linear combination