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Standard median filtering that is searched repeatedly for a median from a sample set which changes only slightly between the subsequent searches is discussed. Several well-known methods for solving this running median problem are reviewed, the (asymptotical) time complexities of the methods are analyzed, and simple variants are proposed which are especially suited for small sample sets, a frequent situation. Although the discussion is restricted to the one-dimensional case, the ideas are easily extended to higher dimensions.>
Juhola et al. (Tue,) studied this question.