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Abstract
We investigate a nonlinear degenerate parabolic equation that is suggested by various numerical approaches to image enhancement.
Acknowledgment
This research was financially supported in part through a cooperation treaty between Charles University in Prague and the University of Cologne. Moreover, the first author was supported in part by the German Research Foundation (DFG) through SFB 359, and the second author was supported by grants MSM 113200007 and 201/03/0934 of the Grant Agency of Czech Republic. We thank P. Quittner for a helpful conversation.