Compressive Image Reconstruction in Reduced Union of Subspaces

Eurographics 2015 - May 2015
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We present a new compressed sensing framework for reconstruction of incomplete and possibly noisy images and their higher dimensional variants, e.g. animations and light-fields. The algorithm relies on a learning-based basis representation. We train an ensemble of intrinsically two-dimensional (2D) dictionaries that operate locally on a set of 2D patches extracted from the input data. We show that one can convert the problem of 2D sparse signal recovery to an equivalent 1D form, enabling us to utilize a large family of sparse solvers. The proposed framework represents the input signals in a reduced union of subspaces model, while allowing sparsity in each subspace. Such a model leads to a much more sparse representation than widely used methods such as K-SVD. To evaluate our method, we apply it to three different scenarios where the signal dimensionality varies from 2D (images) to 3D (animations) and 4D (light-fields).

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BibTex references

@InProceedings\{MKU15,
  author       = "Miandji, Ehsan and Kronander, Joel and Unger, Jonas",
  title        = "Compressive Image Reconstruction in Reduced Union of Subspaces",
  booktitle    = "Eurographics 2015",
  month        = "May",
  year         = "2015"
}

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