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Improving Dictionary Learning: Multiple Dictionary Updates and Coefficient Reuse

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2 Author(s)
Smith, L.N. ; Opt. Sci. Div., US Naval Res. Lab., Washington, DC, USA ; Elad, M.

In this letter, we propose two improvements of the MOD and K-SVD dictionary learning algorithms, by modifying the two main parts of these algorithms-the dictionary update and the sparse coding stages. Our first contribution is a different dictionary-update stage that aims at finding both the dictionary and the representations while keeping the supports intact. The second contribution suggests to leverage the known representations from the previous sparse-coding in the quest for the updated representations. We demonstrate these two ideas in practice and show how they lead to faster training and better quality outcome.

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Signal Processing Letters, IEEE  (Volume:20 ,  Issue: 1 )