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<p>The application of nonlinear median and alpha-trimmed mean filters to computer graphics is discussed. The filters are simple to implement, do not require large amounts of CPU time to execute, and can be applied iteratively for better control over the filtering effects. A series of examples shows that the filters eliminate spike noise in a stochastic sampling application without smearing the final image.</p>
Richard A. Redner, Mark E. Lee, "Filtering: A note on the Use of Nonlinear Filtering in Computer Graphics", IEEE Computer Graphics and Applications, vol. 10, no. , pp. 23-29, May/June 1990, doi:10.1109/38.55149
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