How to do a maximum rank filter

5 views (last 30 days)
Jimmy Neutron
Jimmy Neutron on 25 Nov 2021
Commented: Jimmy Neutron on 27 Nov 2021
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;
79 176 39 27 22 46;
135 191 211 256 102 67;
42 115 137 1 66 37;
154 21 254 198 204 35;
67 58 20 208 110 222];
localMaxImage = imdilate(M, true(3))

Accepted Answer

yanqi liu
yanqi liu on 26 Nov 2021
clc; clear all; close all;
M = [203 167 233 113 222 232;
79 176 39 27 22 46;
135 191 211 256 102 67;
42 115 137 1 66 37;
154 21 254 198 204 35;
67 58 20 208 110 222];
localMaxImage = imdilate(M, true(3))
localMaxImage = 6×6
203 233 233 233 232 232 203 233 256 256 256 232 191 211 256 256 256 102 191 254 256 256 256 204 154 254 254 254 222 222 154 254 254 254 222 222
fun = @(block_struct) max(max(block_struct.data)) * ones(size(block_struct.data));
localMaxImage2 = blockproc(M,[3 3],fun)
localMaxImage2 = 6×6
233 233 233 256 256 256 233 233 233 256 256 256 233 233 233 256 256 256 254 254 254 222 222 222 254 254 254 222 222 222 254 254 254 222 222 222

More Answers (1)

Image Analyst
Image Analyst on 25 Nov 2021
Looks right to me. Do you think something is wrong with that?
  1 Comment
Jimmy Neutron
Jimmy Neutron on 27 Nov 2021
It is correct, I am not sure why I thought it was not... Thank you for your reply :)

Sign in to comment.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!