Improved adaptive median filtering algorithm
Zhao Jing-xiu · Journal of Computer Applications · 2011
The size of median filtering window influences the capability of filter and 3×3 filtering window can preserve image details.An adaptive median filtering method was proposed.The extreme value point in 3×3 filter window was taken as candidate noise.If the candidate noise is extreme value in 7×7 window,then it is a sure noise.If the median value of 3×3 filter window is not noise,then the central noise would be replaced with the median value.The steps above were repeated until there was no noise replaced.If there still existed large noise cluster,the noise would be replaced with the mean of the three signals near it.The experimental results show that the method can denoise impulse noise and protect the image details effectively.