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Improving Dictionary Learning: Multiple Dictionary Updates and Coefficient Reuse
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DOI：10.1109/LSP.2012.2229976.png)
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Abstract
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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.
Keywords:
Dictionary-learning
K-SVD
MOD
sparse and redundant representations
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9.6
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1.1W
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1.7W
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