-In the case of 2D continuous K-SVD, discrete atoms are replaced with 'continuous atoms' represented as linear combinations of products of cosines mapping from a 2D coordinate plane. This allows sparse coding unstructured signals of variable length as values sampled at locations in a 2D plane, as well as predicting signal values away from the sampled locations (c.f. "Cloud Dictionary: Coding and Modeling for Point Clouds", https://arxiv.org/abs/1612.04956)"
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