How to do a maximum rank filter

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))

Answer 1

[yanqi liu]

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

Answer 2

[Image Analyst]

Looks right to me. Do you think something is wrong with that?

[Jimmy Neutron]

It is correct, I am not sure why I thought it was not... Thank you for your reply :)