Multi Scale Adaptive Median Filter for Impulsive Noise Removal

Adaptive median filter has been an efficient algorithm for impulsive noise removal. However, if the noises are very heavy, adaptive median filter may still remain noise regions in result image. Actually, noise pixels usually exist in different scales of image. So, a multi scale adaptive median filter is proposed in this paper. The multi scale adaptive median filter is a sequence of adaptive median filter using maximum windows with increasing sizes. Because the noises exist at multi scales could be identified, multi scale adaptive median filter could efficiently filter very heavy noises in image. Experimental results show that multi scale adaptive median filter could be very efficient even though the impulsive noises are very heavy.