2003 | OriginalPaper | Buchkapitel
Correspondences between Wavelet Shrinkage and Nonlinear Diffusion
verfasst von : Pavel Mrázek, Joachim Weickert, Gabriele Steidl
Erschienen in: Scale Space Methods in Computer Vision
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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We study the connections between discrete one-dimensional schemes for nonlinear diffusion and shift-invariant Haar wavelet shrinkage. We show that one step of (stabilised) explicit discretisation of nonlinear diffusion can be expressed in terms of wavelet shrinkage on a single spatial level. This equivalence allows a fruitful exchange of ideas between the two fields. In this paper we derive new wavelet shrinkage functions from existing diffusivity functions, and identify some previously used shrinkage functions as corresponding to well known diffusivities. We demonstrate experimentally that some of the diffusion-inspired shrinkage functions are among the best for translation-invariant multiscale wavelet shrinkage denoising.