Sparse representations are most likely to be the sparsest possible

  • Authors:
  • Michael Elad

  • Affiliations:
  • Computer Science Department, The Technion - Israel Institute of Technology, Haifa, Israel

  • Venue:
  • EURASIP Journal on Applied Signal Processing
  • Year:
  • 2006

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Abstract

Given a signal S ∈ RN and a full-rank matrix D ∈ RN×L with N , we define the signal's overcomplete representations as all α ∈ RL satisfying S = Dα. Among all the possible solutions, we have special interest in the sparsest one--the one minimizing ||α||o. Previous work has established that a representation is unique if it is sparse enough, requiring ||α||o o