Abstract
This paper develops a novel copula denoising optimization solution for separating Poisson noise from images, or removing mixtures of Poisson and Gaussian noise. The proposed approach is elaborated in two steps: first, a spatial bilateral total variation (BTV) regularization is used to reduce Gaussian noise; second, a learning copula procedure is employed to separate the Poisson noise from the ideal image. This leads to capture different image features while significantly reducing the noise. Analytically, we include results on the approximation of the Poisson component as well as the resolution of the proposed optimization model. In addition, to resolve the BTV minimization problem, we proposed an alternating direction method of multipliers algorithm. Finally, numerical results are provided to remove noise while preserving important details and features, along with convincing comparisons to demonstrate the performance of the proposed approach. We show, in particular, that using a large database can improve the robustness of the proposed algorithm.
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The datasets generated during the current real study are available in https://www.oasis-brains.org/#data.
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Ghazdali, A., Hadri, A., Laghrib, A. et al. A Blind Poisson–Gaussian Noise Separation Using Learning Copula Densities. Circuits Syst Signal Process 42, 6564–6590 (2023). https://doi.org/10.1007/s00034-023-02326-1
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DOI: https://doi.org/10.1007/s00034-023-02326-1