Grading Median Algorithm for Filtering Salt and Pepper Noises in Image
Yan Zi-y · Journal of University of South China · 2013
A grading median filtering algorithm was proposed to offset the defect of adaptive median filter(AMF) that it left some black plaque after filtering images corrupted by high density salt and pepper noises. Through twice filter to the noise image with small size window,compared with bigger ones,it reduced the blur degree of result image. For the first time,it eliminated the salt noise by using median filter(MF)to noise pixels,and then wiped off the black plaque by replacing pepper noise pixels with the median of the noise free pixels in its 8-neighborhood. Lastly,the simulation result shows,our algorithm either has the good capability to filter the low density noises as well as AMF or has the ability to filter higher density salt and pepper noises in image.