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In this paper, a two-stage filter for removing salt-and-pepper noise using noise detector based on characteristic difference parameter and adaptive directional mean filter is proposed. The first stage firstly detects the noise corrupted pixels by combining characteristic difference parameter and gray level extreme, then develops an improved adaptive median filter to firstly restore them. The second stage introduces a restoration scheme to further restore the noise corrupted pixels, whichdoi:10.1371/journal.pone.0205736 pmid:30365501 pmcid:PMC6203255 fatcat:sp5echlmq5hfplhfomkb5e5bne