Title: Analysis of adaptive forward-backward diffusion flows with applications in image processing
Authors: Prasath, V B Surya 
Urbano, José Miguel 
Vorotnikov, Dmitry 
Issue Date: 2015
Publisher: IOP Publishing
Project: PEst-C/MAT/UI0324/2011 
Abstract: The nonlinear diffusion model introduced by Perona and Malik (1990 IEEE Trans. Pattern Anal. Mach. Intell. 12 629–39) is well suited to preserve salient edges while restoring noisy images. This model overcomes well-known edge smearing effects of the heat equation by using a gradient dependent diffusion function. Despite providing better denoizing results, the analysis of the PM scheme is difficult due to the forward-backward nature of the diffusion flow. We study a related adaptive forward-backward diffusion equation which uses a mollified inverse gradient term engrafted in the diffusion term of a general nonlinear parabolic equation. We prove a series of existence, uniqueness and regularity results for viscosity, weak and dissipative solutions for such forward-backward diffusion flows. In particular, we introduce a novel functional framework for wellposedness of flows of total variation type. A set of synthetic and real image processing examples are used to illustrate the properties and advantages of the proposed adaptive forward-backward diffusion flows.
URI: http://hdl.handle.net/10316/44400
Other Identifiers: 10.1088/0266-5611/31/10/105008
DOI: 10.1088/0266-5611/31/10/105008
Rights: embargoedAccess
Appears in Collections:I&D CMUC - Artigos em Revistas Internacionais

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