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Color Sparse Representations for Image Processing: Review, Models, and Prospects

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Figure

Fig. 1. Illustration of the color models: (a) is the vectorized model of Eq. (15), and (b) is the quaternionic model of Eq
Fig. 3. Left: averaged training fitting errors as a function of learning iterations, for K-SVD (cyan, solid line), iK-SVD (blue, dotted line), K-QSVD (red, dashed line) and K-QSVD (full) with full quaternionic atoms (magenta, solid line)
Fig. 2. Visualization of the color image dictionaries learned by K-SVD (left column), improved K-SVD (middle), and K-QSVD (right), with the channel-wise shift and rescaling (a), and the global shift (b)
Fig. 4. Illustration of the reformulated color models: (a) is the vectorized model of Eq
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