47 search results - page 3 / 10 » Dictionary Optimization for Block-Sparse Representations |
TIT
2002
14 years 9 months ago
2002
An elementary proof of a basic uncertainty principle concerning pairs of representations of vectors in different orthonormal bases is provided. The result, slightly stronger than s...
118
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CVPR
2012
IEEE
12 years 12 months ago
2012
IEEE
A greedy-based approach to learn a compact and discriminative dictionary for sparse representation is presented. We propose an objective function consisting of two components: ent...
TSP
2008
14 years 9 months ago
2008
Sparse signal representations and approximations from overcomplete dictionaries have become an invaluable tool recently. In this paper, we develop a new, heuristic, graph-structure...
ICIP
2003
IEEE
15 years 11 months ago
2003
IEEE
The purpose of this paper is to generalize a result by Donoho, Huo, Elad and Bruckstein on sparse representations of signals/images in a union of two orthonormal bases. We conside...
109
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PAMI
2007
14 years 9 months ago
2007
In this paper we present a two-level generative model for representing the images and surface depth maps of drapery and clothes. The upper level consists of a number of folds whic...