Image impulse noise filtering algorithm
Yong Fan · Jisuanji gongcheng yu sheji · 2010
An improved median filtering method is proposed to suppress the impulse noise with low contamination ratios.It determines the threshold adaptively by calculating the average gray and variance of the pixels in the slide window according to the mathematical statistics characteristic,and replaces the pixels which are deemed as impulse noise by the median gray of slide window.Then uses the switch median filtering method to smooth the pixels which are not suit for noise condition in the former step again.Experiments indicate that proposed filtering method can remove the impulse noise effectively and preserve the image edge,furthermore,it brings down the dependency of the image threshold as well as the degree of damage of the image edge,and outperforms some typical improved median fil-tering method.