Journal ArticleDOI
Deterministic properties of the recursive separable median filter
M. McLoughlin,Gonzalo R. Arce +1 more
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TLDR
Using threshold decomposition, the root structure of the recursive separable median filter is derived, where a root is a signal invariant to further filtering, and it is shown that these root structures differ from those of their nonrecursive counterparts.Abstract:
The recursive separable median filter has been successfully used to extract features from noisy two-dimensional signals. In many applications, it gives better noise suppression and edge preservation than the standard separable median filter. In this paper we use a new approach for studying the deterministic properties of separable median filters. In particular, using threshold decomposition, we derive the root structure of the recursive separable median filter, where a root is a signal invariant to further filtering. It is shown that these root structures differ from those of their nonrecursive counterparts. We also show that any two-dimensional signal will converge to a root after repeated passes of the recursive separable median filter.read more
Citations
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Journal ArticleDOI
Order statistics in digital image processing
TL;DR: In this article, a family of nonlinear filters based on order statistics is presented, and the probabilistic and deterministic properties of the best known and most widely used filter, the median filter, are discussed.
Journal ArticleDOI
Optimal stack filtering and the estimation and structural approaches to image processing
TL;DR: A theory of optimal stack filtering under structural constraints and goals has been developed for the structural approach to image processing and two optimal stack filters theories have been combined into a single design theory for rank-order-based filters.
Journal ArticleDOI
An overview of median and stack filtering
TL;DR: In this article, the authors trace the development of nonlinear filtering from its beginnings in the study of noise-removal properties and structural behavior of the median filter to the recently developed theory of optimal stack filtering.
Journal ArticleDOI
Center weighted median filters: some properties and their applications in image processing
TL;DR: It is proven that repeated filtering on any appended finite length signal by any CWM filter produces roots in a finite number of filter passes, which means that by using CWM filters, more details can be preserved along the horizontal and vertical directions.
Journal ArticleDOI
Histogram-based fuzzy filter for image restoration
TL;DR: A novel approach to the restoration of noise-corrupted image is presented, which is particularly effective at removing highly impulsive noise while preserving image details through a fuzzy smoothing filter constructed from a set of fuzzy membership functions for which the initial parameters are derived in accordance with input histogram.
References
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Journal ArticleDOI
A theoretical analysis of the properties of median filters
Neal C. Gallagher,G. Wise +1 more
TL;DR: In this article, the authors derived necessary and sufficient conditions for a signal to be invariant under a specific form of median filtering and proved that the form of successive median filtering of a signal (i.e., the filtered output is itself again filtered) eventually reduces the original signal to an invariant signal called a root signal.
Journal ArticleDOI
Median filters: Some modifications and their properties
T. Nodes,Neal C. Gallagher +1 more
TL;DR: It is proved that the output of a recursive median filter is invariant to subsequent passes by the same filter and that for nonmedian nth ranked-order operations, repeated application of the operation will reduce any signal to a constant.
Journal ArticleDOI
Median filtering by threshold decomposition
TL;DR: It is shown that median filtering an arbitrary level signal to its root is equivalent to decomposing the signal into binary signals, filtering each binary signal to a root with a binary median filter, and then reversing the decomposition.
Journal ArticleDOI
State description for the root-signal set of median filters
TL;DR: A tree structure for the root signal set of median filters, where signals invariant to median filters are called roots of the signal, is obtained for binary signals.
Journal ArticleDOI
Two-dimensional root structures and convergence properties of the separable median filter
T. Nodes,Neal C. Gallagher +1 more
TL;DR: In this paper, the root structures of the separable median filter were derived and shown to be invariant to filtering, and it was proved that after repetitive passes of the median filter any two-dimensional signal will be reduced to a signal containing only root structures.
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