Pseudo-median filter with enhancing impulse suppression

Pseudo-median filter is a computationally efficient alternative to median filter that applicable to data processing in low-level hardware platform of wireless sensor network nodes. In order to make the pseudo-median filter be able to remove impulses as does median filter and maintain the advantages of performance, a kind of improved pseudo-median filter algorithm with impulsive noise detecting and suppressing is proposed in this paper. By contrasting the increment of the maximum of the minima and the increment of the minimum of the maxima relative to the level of current filtering signal within the filtering window, the impulse can be detected and the output of signal polluted by the impulse is substituted by approximation. The simulation results and calculation complexity analysis show the improved algorithm obviously enhances the ability of impulse-attenuation and is a higher efficient alternative to median filter for the application in wireless sensor network.