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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50972

Title: HAF: An adaptive fuzzy filter for restoring highly corrupted images by histogram estimation
Contributors: 國立臺灣海洋大學電機工程學系
Keywords: adaptive fuzzy filter
image histogram
image restoration
impulse noise
median filter
membership functions
Date: 1999-03
Issue Date: 2018-11-02T01:58:13Z
Publisher: Proceedings of the National Science Council -Part A
Abstract: Abstract: This paper presents a novel adaptive approach to image restoration using fuzzy spatial filtering
optimized via image statistics rather than a prior knowledge of specific image data. The proposed histogram
adaptive fuzzy (HAF) filter is particularly effective for removing highly impulsive noise while preserving
edge sharpness. This is accomplished through a fuzzy smoothing filter constructed from a set of fuzzy
IF-THEN rules, which alternate adaptively to minimize the output mean squared error as input histogram
statistics change. An algorithm is developed to utilize (corrupted) input histogram to determine parameters
for the near-optimal fuzzy membership functions. Construction of the HAF filter involves three steps:
(1) define fuzzy sets in the input space, (2) construct a set of IF-THEN rules by incorporating input histogram
statistics to form the fuzzy membership functions, and (3) construct the filter based on the set of rules.
Similar to the conventional median filters (MF), the proposed method has the following merits: it is simple,
and it assumes no a priori knowledge of a specific input image, yet it has superior performance compared
to other existing ranked-order filters (including MF) for the full range of impulsive noise probability. Unlike
many neuro-fuzzy or fuzzy-neuro filters, where a random strategy is employed to choose initial membership
functions for subsequent lengthy training, HAF can achieve near-optimal performance without any training.
Relation: 23(5) pp.630-643
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50972
Appears in Collections:[電機工程學系] 期刊論文

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