A backward-forward regularization of the Perona-Malik equation

JOURNAL OF DIFFERENTIAL EQUATIONS

卷:252

Article

Guidotti, Patrick

关键词: Nonlinear diffusion;    Forward-backward diffusion;    Well-posedness;    Young measure solutions;    Perona-Malik type equation;    Global existence;    Qualitative behavior;   

DOI  :  10.1016/j.jde.2011.10.022

来源: Elsevier

【 摘 要 】

It is shown that the Perona-Malik equation (PME) admits a natural regularization by forward-backward diffusions possessing better analytical properties than PME itself. Well-posedness of the regularizing problem along with a complete understanding of its long time behavior can be obtained by resorting to weak Young measure valued solutions in the spirit of Kinderlehrer and Pedregal (1992) [1] and Demoulini (1996) In Solutions are unique (to an extent to be specified) but can exhibit micro-oscillations (in the sense of minimizing sequences and in the spirit of material science) between preferred gradient states. In the limit of vanishing regularization, the preferred gradients have size 0 or infinity thus explaining the well-known phenomenon of staircasing. The theoretical results do completely confirm and/or predict numerical observations concerning the generic behavior of solutions. (C) 2011 Elsevier Inc. All rights reserved.

【 授权许可】

Free