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• W1992882016 abstract "Anisotropic diffusion has been known to be closely related to adaptive smoothing and discretized in a similar manner. This paper revisits a fundamental relationship between two approaches. It is shown that adaptive smoothing and anisotropic diffusion have different theoretical backgrounds by exploring their characteristics with the perspective of normalization, evolution step size, and energy flow. Based on this principle, adaptive smoothing is derived from a second order partial differential equation (PDE), not a conventional anisotropic diffusion, via the coupling of Fick's law with a generalized continuity equation where a source or sink exists, which has not been extensively exploited. We show that the source or sink is closely related to the asymmetry of energy flow as well as the normalization term of adaptive smoothing. It enables us to analyze behaviors of adaptive smoothing, such as the maximum principle and stability with a perspective of a PDE. Ultimately, this relationship provides new insights into application-specific filtering algorithm design. By modeling the source or sink in the PDE, we introduce two specific diffusion filters, the robust anisotropic diffusion and the robust coherence enhancing diffusion, as novel instantiations which are more robust against the outliers than the conventional filters." @default.
• W1992882016 created "2016-06-24" @default.
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• W1992882016 date "2013-03-01" @default.
• W1992882016 modified "2023-10-16" @default.
• W1992882016 title "Revisiting the Relationship Between Adaptive Smoothing and Anisotropic Diffusion With Modified Filters" @default.
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• W1992882016 doi "https://doi.org/10.1109/tip.2012.2226904" @default.
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