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A two-pass median-like filter for impulse noise removal in multi-channel images

Grabowski S., Bieniecki W.

Image Processing & Communications

2003

Vol. 9, no 3-4

19-26

We propose a two-pass median filter for impulse noise suppression in color images. The first pass is our previously presented algorithm, PNN-VMF [2]. The second pass routine is chosen dynamically on the basis of the number of pixel modifications performed by the first pass filtering. Such an approach is likely to avoid harm (e.g., blurring edges) resulting from excessive filtering. The effectiveness of the algorithm has been experimentally verified on 15 standard images.