Is there an alternative to 5x5 median filter in MATLAB?

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Matthew Worker
Matthew Worker 2021-10-4
回答： yanqi liu 2021-12-11
I want the same result, but without using medfilt2
x=imread('sadimg.bmp');
y= medfilt2(x,[5 5])

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回答（2 个）

Image Analyst
Image Analyst 2021-10-4
编辑：Image Analyst 2021-10-4
Yes, remember our discussion in your duplicate question in:
https://www.mathworks.com/matlabcentral/answers/1466294-5-x-5-median-filter-with-out-inbuilt-function#comment_1767564
Also see my attached Salt and Pepper filter.
yanqi liu
yanqi liu 2021-12-11
Ran in:
if use self define function，may be use colfilt、nlfilter to get block process，such as
clc;
clear all;
close all;
im = imread('cameraman.tif');
im2 = imnoise(im, 'salt & pepper');
%fun = @(block_struct) median(block_struct(:));
%im3 = nlfilter(im2,[5 5],fun);
fun = @(block_struct) median(block_struct);
im3 = colfilt(im2,[5 5],'sliding',fun);
im4 = medfilt2(im2, [5 5]);
figure;
subplot(2,2,1); imshow(im);
subplot(2,2,2); imshow(im2);
subplot(2,2,3); imshow(im3);
subplot(2,2,4); imshow(im);

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