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A tensor-based dictionary learning approach to tomographic image reconstruction

Published: 01 December 2016 Publication History

Abstract

We consider tomographic reconstruction using priors in the form of a dictionary learned from training images. The reconstruction has two stages: first we construct a tensor dictionary prior from our training data, and then we pose the reconstruction problem in terms of recovering the expansion coefficients in that dictionary. Our approach differs from past approaches in that (a) we use a third-order tensor representation for our images and (b) we recast the reconstruction problem using the tensor formulation. The dictionary learning problem is presented as a non-negative tensor factorization problem with sparsity constraints. The reconstruction problem is formulated in a convex optimization framework by looking for a solution with a sparse representation in the tensor dictionary. Numerical results show that our tensor formulation leads to very sparse representations of both the training images and the reconstructions due to the ability of representing repeated features compactly in the dictionary.

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            Published In

            cover image BIT
            BIT  Volume 56, Issue 4
            Dec 2016
            352 pages

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            BIT Computer Science and Numerical Mathematics

            United States

            Publication History

            Published: 01 December 2016

            Author Tags

            1. Tensor decomposition
            2. Tensor dictionary learning
            3. Inverse problem
            4. Regularization
            5. Sparse representation
            6. Tomographic image reconstruction

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            • (2023)A Fixed Point Iterative Method for Third-order Tensor Linear Complementarity ProblemsJournal of Optimization Theory and Applications10.1007/s10957-023-02169-5197:1(334-357)Online publication date: 13-Feb-2023
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