Learning Incoherent Dictionaries for Sparse Approximation Using Iterative Projections and Rotations

  title={Learning Incoherent Dictionaries for Sparse Approximation Using Iterative Projections and Rotations},
  author={Daniele Barchiesi and Mark D. Plumbley},
  journal={IEEE Transactions on Signal Processing},
This article deals with learning dictionaries for sparse approximation whose atoms are both adapted to a training set of signals and mutually incoherent. To meet this objective, we employ a dictionary learning scheme consisting of sparse approximation followed by dictionary update and we add to the latter a decorrelation step in order to reach a target mutual coherence level. This step is accomplished by an iterative projection method complemented by a rotation of the dictionary. Experiments on… CONTINUE READING
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Dictionary learning for the sparse approximation of audio signals

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Learning incoherent dictionaries using iterative projections and lie group optimisation

  • D. Barchiesi, M. D. Plumbley
  • available at http://www.eecs.qmul.ac.uk/ danieleb…
  • 2012
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