How to do a maximum rank filter

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Jimmy Neutron 2021-11-25

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https://ww2.mathworks.cn/matlabcentral/answers/1595699-how-to-do-a-maximum-rank-filter

评论： Jimmy Neutron 2021-11-27

I would like to do a 3x3 max-rank filter with 0 padding. How would I go about doing this? Currently I have tried:

M = [203 167 233 113 222 232;
176 39 27 22 46;
191 211 256 102 67;
115 137 1 66 37;
21 254 198 204 35;
58 20 208 110 222];
localMaxImage = imdilate(M, true(3))

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Answer 1

yanqi liu 2021-11-26

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https://ww2.mathworks.cn/matlabcentral/answers/1595699-how-to-do-a-maximum-rank-filter#answer_840774

clc; clear all; close all;
M = [203 167 233 113 222 232;
176 39 27 22 46;
191 211 256 102 67;
115 137 1 66 37;
21 254 198 204 35;
58 20 208 110 222];
localMaxImage = imdilate(M, true(3))
localMaxImage = 6×6
 233   233   233   232   232
 233   256   256   256   232
 211   256   256   256   102
 254   256   256   256   204
 254   254   254   222   222
 254   254   254   222   222
fun = @(block_struct) max(max(block_struct.data)) * ones(size(block_struct.data));
localMaxImage2 = blockproc(M,[3 3],fun)
localMaxImage2 = 6×6
 233   233   256   256   256
 233   233   256   256   256
 233   233   256   256   256
 254   254   222   222   222
 254   254   222   222   222
 254   254   222   222   222