“K-SVD meets Transform Learning: Transform K-SVD” Home

E.M. Eksioglu and Ozden Bayir, “K-SVD meets Transform Learning: Transform K-SVD”, IEEE Signal Processing Letters, vol. 21, no. 3, pp. 347-351, March 2014. [pdf]

MATLAB code to to realize the Transform K-SVD algorithm:

Transform K-SVD Matlab code

The above given Transform K-SVD function can be used in conjunction with the Analysis K-SVD toolbox available online . The Transform K-SVD function can simply be used as the operator/transform learning step in the proper position.

Abstract:

Recently there has been increasing attention directed towards the analysis sparsity models. Consequently, there is a quest for learning the operators which would enable analysis sparse representations for signals in hand. Analysis operator learning algorithms such as the Analysis K-SVD have been proposed. Sparsifying transform learning is a paradigm which is similar to the analysis operator learning, but they differ in some subtle points. In this paper, we propose a novel transform operator learning algorithm called as the Transform K-SVD, which brings the transform learning and the K-SVD based analysis dictionary learning approaches together. The proposed Transform K-SVD has the important advantage that the sparse coding step of the Analysis K-SVD gets replaced with the simple thresholding step of the transform learning framework. We show that the Transform K-SVD learns operators which are similar both in appearance and performance to the operators learned from the Analysis K-SVD, while its computational complexity stays much reduced compared to the Analysis K-SVD.