An Improved Adaptive Median Filter Algorithm
Xiaochun Chen · 2006
An improved adaptive median-based filter,based on extremum median filter,is proposed to restore images corrupted by salt and pepper noise,especially for those with unknown noise ratio.There are mainly two improved points in this algorithm:(1) a fuzzy measure is proposed to judge the noise ratio;(2)a gradient operator is introduced to save the thin lines,such as edge information.It gets some useful information by training and simulating.Compared with traditional median filter,ordering threshold switching median filter and improved median filter proposed by Sorin Zoican,our approach is more adaptive and receives better results.