論文

査読有り
2017年5月

Analysis dictionary learning using block coordinate descent framework with proximal operators

NEUROCOMPUTING
  • Zhenni Li
  • ,
  • Shuxue Ding
  • ,
  • Takafumi Hayashi
  • ,
  • Yujie Li

239
C
開始ページ
165
終了ページ
180
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.neucom.2017.02.014
出版者・発行元
ELSEVIER SCIENCE BV

In this study, we propose two analysis dictionary learning algorithms for sparse representation with analysis model. The problem is formulated with the l(1)-norm regularizer and with two penalty terms on the analysis dictionary: the term of -log det(Omega(T)Omega) and the coherence penalty term. As the processing scheme, we employ a block coordinate descent framework, so that the overall problem is transformed into a set of minimizations of univariate subproblems with respect to a single-vector variable. Each subproblem is still nonsmooth, but it can be solved by a proximal operator and then the closed-form solutions can be obtained directly and explicitly. In particular, the coherence penalty, excluding excessively similar or repeated dictionary atoms, is solved at the same time as the dictionary update, thereby reducing the complexity. Furthermore, a scheme with a group of atoms is introduced in one proposed algorithm, which has a lower complexity. According to our analysis and simulation study, the main advantages of the proposed algorithms are their greater dictionary recovery ratios especially in the low-cosparsity case, and their faster running time of reaching the stable values of the dictionary recovery ratios and the recovery cosparsity compared with state-of-the-art algorithms. In addition, one proposed algorithm performs well in image denoising and in noise cancellation. (C) 2017 Elsevier B.V. All rights reserved.

リンク情報
DOI
https://doi.org/10.1016/j.neucom.2017.02.014
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000397689300016&DestApp=WOS_CPL
ID情報
  • DOI : 10.1016/j.neucom.2017.02.014
  • ISSN : 0925-2312
  • eISSN : 1872-8286
  • Web of Science ID : WOS:000397689300016

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