Abstract
We introduce a coefficient update procedure into existing batch and online dictionary learning algorithms. We first propose an algorithm which is a coefficient updated version of the Method of Optimal Directions (MOD) dictionary learning algorithm (DLA). The MOD algorithm with coefficient updates presents a computationally expensive dictionary learning iteration with high convergence rate. Secondly, we present a periodically coefficient updated version of the online Recursive Least Squares (RLS)-DLA, where the data is used sequentially to gradually improve the learned dictionary. The developed algorithm provides a periodical update improvement over the RLS-DLA, and we call it as the Periodically Updated RLS Estimate (PURE) algorithm for dictionary learning. The performance of the proposed DLAs in synthetic dictionary learning and image denoising settings demonstrates that the coefficient update procedure improves the dictionary learning ability.
Original language | English |
---|---|
Pages (from-to) | 3682-3690 |
Number of pages | 9 |
Journal | Expert Systems with Applications |
Volume | 41 |
Issue number | 8 |
DOIs | |
Publication status | Published - 15 Jun 2014 |
Keywords
- Dictionary learning
- Image denoising
- Online learning
- Sparse representation