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Proceedings Paper

Edge-preserving smoothing using median finite impulse response (FIR) hybrid filters
Author(s): Mitsuji Muneyasu; Kentaro Hotta; Takao Hinamoto; Akira Taguchi
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Paper Abstract

In image processing, one of the important problems is edge-preserving smoothing in mixed noise environment such that both Gaussian noise and impulsive noise exist. Recently, several types of the hybrid filter which is a kind of nonlinear filter have been proposed for this purpose. In this paper, a technique for edge-preserving smoothing is developed by using median finite impulse response (FIR) neural hybrid filters. This filter structure is represented by the cascade connection of median filter, FIR filter, and neural network. In this structure, the section of a median filter selects the median value among 3 points and the section of an FIR filter calculates the mean value of 3 points. The section of neural network consists of three layered structure and its inputs equal the output from the section of a median filter and the output from the section of an FIR filter. The major features of this filter are as follows: (1) This filter can adapt itself to the various noise environment through the learning of a training image. (2) Even if a priori data such a training image is unavailable, this filter can efficiently be applied to edge-preserving smoothing for the images degraded by the Gaussian and impulsive noises. Moreover, the structure of the proposed filter is very simple.

Paper Details

Date Published: 28 March 1995
PDF: 12 pages
Proc. SPIE 2424, Nonlinear Image Processing VI, (28 March 1995); doi: 10.1117/12.205253
Show Author Affiliations
Mitsuji Muneyasu, Hiroshima Univ. (Japan)
Kentaro Hotta, Hiroshima Univ. (Japan)
Takao Hinamoto, Hiroshima Univ. (Japan)
Akira Taguchi, Musashi Institute of Technology (Japan)


Published in SPIE Proceedings Vol. 2424:
Nonlinear Image Processing VI
Edward R. Dougherty; Jaakko T. Astola; Harold G. Longbotham; Nasser M. Nasrabadi; Aggelos K. Katsaggelos, Editor(s)

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