NDLI: Revisiting the Relationship Between Adaptive Smoothing and Anisotropic Diffusion With Modified Filters

Content Provider	IEEE Xplore Digital Library
Author	Bumsub Ham Dongbo Min Kwanghoon Sohn
Copyright Year	1992
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.
Sponsorship	IEEE Signal Processing Society
Page Count	12
File Size	4529117
Starting Page	1096
Ending Page	1107
File Format	PDF
ISSN	10577149
Volume Number	22
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Smoothing methods Anisotropic magnetoresistance Equations Mathematical model Kernel Robustness Energy exchange normalization Adaptive smoothing anisotropic diffusion coherence enhancing diffusion energy flow generalized continuity equation
Content Type	Text
Resource Type	Article
Subject	Computer Graphics and Computer-Aided Design Software

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