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Original image Image + noise Median filter (3x3)

Star median filter (3x3) Recursive median filter (3x3) Multistage median filter (3x3)

Weighted median filter w=3 (3x3) Weighted median filter w=5 (3x3) Weighted median filter w=7 (3x3)

Fuzzy median filter (Xilinx) (5x5) FIRE filter Gaussian fuzzy filter with median center GMED

Symmetrical triangle fuzzy filter with average center (TMAV) Symmetrical triangle fuzzy filter with median center (TMED) Asymmetrical triangle fuzzy filter with median center (ATMED)

Asymmetrical triangle fuzzy filter with average center (ATMAV) Gaussian fuzzy filter with moving average center (GMAV) Fuzzy multilevel median filter (FMMF)

Useful books and articles William K. Pratt Digital Image Processing, 2001 Rafael C. Gonzalez, Richard E. Woods Digital Image Processing, Addison-Wesley Publishing Company, 1993 Mike Nachtegael, Dietrich Van der Weken, Dimitri Van De Ville, Etienne E. Kerre Fuzzy Filters for Image Processing. Springer Verlag, 2004 Etienne E. Kerre, Mike Nachtegael Fuzzy Techniques in Image Processing, Springer Verlag, 2001 L. Yin, R. Yang, M. Gabbouj, Y.Neuvo Weighted Median Filters: a Tutorial, IEEETransactions On Circuits and Systems – II: Analog and Digital Signal Processing, vol. 43, No. 3, March 1996, pp. 157-192. Sung-Jea Ko, Yong Hoon Lee Center weighted median filters and their applications to image enhancement, IEEE Transactions on Circuits and Systems, Volume: 38, Issue: 9, September 1991. S. J. Ko, Y. H. Lee , and A. T. Fam Efficient Implementation of One-Dimensional Recursive Median Filters, IEEE Transactions on Circuits and Systems, vol. CAS-37, pp. 1447–1450, Nov. 1990. X. Wang Adaptive Multistage Median Filter,IEEE Transactions on Signal Processing, vol.40, No 4, April 1992. Justin G. R. Delva, Ali M. Reza, and Robert D. Turney FPGA Implementation of a Nonlinear Two Dimensional Fuzzy Filter Fabrizio Russo - Giovanni Ramponi Removal of impulse noise using a fire filter Jiu J.Y. Multilevel median filter based on decison, DSP IC Design LAb E.E. NTU., 1996 Magdalena Szaber Image distortion analysis in path tracing algorithm in terms of median filter techniques usage. International Conference on Signals and Electronics Systems, ICSES'04, Poznan 2004