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Median filter

About: Median filter is a research topic. Over the lifetime, 12479 publications have been published within this topic receiving 178253 citations.


Papers
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Journal ArticleDOI
TL;DR: Performance Comparison of Median and Wiener Filters in Image de-noising for Gaussian noise, Salt & Pepper noise and Speckle noise is dealt with.
Abstract: Image filtering algorithms are applied on images to remove the different types of noise that are either present in the image during capturing or injected into the image during transmission. This paper deals with Performance Comparison of Median and Wiener Filters in Image de-noising for Gaussian noise, Salt & Pepper noise and Speckle noise.

93 citations

01 Jan 1993

93 citations

Journal ArticleDOI
TL;DR: The SMFAMF filter is an improved version of adaptive median filter (AMF) in order to reduce additive impulse noise in the images and can preserve details in the image better than AMF while suppressing additive salt&pepper or impulse type noises.

92 citations

Journal ArticleDOI
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.
Abstract: Median filtering is a simple digital technique for smoothing signals. One main characteristic of the filter is that it maps the input signal space into a root signal space, where signals invariant to median filters are called roots of the signal. In this paper, we develop the theory for the root signal set of median filters. A tree structure for the root signal set is obtained for binary signals. The number of roots R (n) for a signal of length "n" and window size filter "2s- 1" is exactly represented by the difference equation R(n) = R(n - 1) + R(n - s). A general solution is obtained in a Z domain approach. Finally, a method for faster one dimensional median filter operation is introduced.

92 citations

Journal ArticleDOI
TL;DR: A general-purpose median filter unit configuration in the form of two single-chip median filters, one extensible and one real time, is described, along with some possible applications.
Abstract: A general-purpose median filter unit configuration in the form of two single-chip median filters, one extensible and one real time, is described. The networks of the chips are pipelined and systolic at bit level and based on odd/even transposition sorting. The chips are implemented in 3- mu m standard CMOS using full-custom VLSI design techniques. The exact median of elements, in a window size w=9 with arbitrary word length L, can be found using only one extensible median filter chip. The filter can be extended to arbitrary window size and word lengths by using many chips. Simulation results show that the extensible median filter chip can be clocked up to 40 MHz and can generate 30/L megamedians per second. The real-time median filter chip can find the exact running medians of elements in a window of a fixed size w=9 with L=8. Simulations show that it can generate up to 50 megamedians per second with a 50-MHz clock. The algorithms, VLSI implementations, and chip test results are presented, along with some possible applications. >

92 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202372
2022186
2021276
2020387
2019478
2018538