外文翻譯---改進(jìn)二維中值濾波器在線(xiàn)脈沖噪聲的抑制(文件)
【正文】 s in the same prossing window. Moveover,these filters tend to blur the images due to too many replacements. proposed a modified multishell median filter (MMMF)[4], which removes most of the shortings associated with the MF and the MMF. However, it is observed that under certain condions, to be discussed in the follow sections, MMMF fails to perform the desired filtering operation .Moreover,the number of calculations/replacements invoved on the basis of MIN/MAX conditions is still too large and makes the filter difficult to realize,particulariy for real time applications. In this paper, the threshold strtegy of MMMF is modified so that: (a) effective noise filtering operations are performed under all conditions,and (b) number of calculations/replacements is reduced and simplified. This results in a simple hardware realization of the filter. MODIFICATION Consider a 3x3processing window, with P5 as the central pixel,as shown in Figure 1. P1 P2 P3 P4 P5 P6 P7 P8 P9 . A 3x3 processing window The output of MMMF as proposed in [4] is Output (X,Y)= Max(P2,P8)if P5﹥ Max[S] P5 if Min [s]﹤ Max[S] Min(P2,P8) if P5﹤ Max[S] (1) Where S is the set of samples surrounding central pixels except(). S=｛ P1,P2,P3,P7,P8,P9｝ (2) The principle invoved in the replacement strategy of Equation (1)
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