## i split the image pixels into many small matrices

### parvatham vijay (view profile)

on 23 Oct 2019
Latest activity Commented on by Rik

on 1 Nov 2019

### Rik (view profile)

i split the image pixels into many small overlapping matrices
block(:,:,kk+j)=grey_img((i:i+2),(j:j+2))

Rik

### Rik (view profile)

on 23 Oct 2019
How do you want to recombine this? Purely based on the variable name I think the blockproc function might be a better choice.
Rik

### Rik (view profile)

on 23 Oct 2019
Comment posted as answer by parvatham vijay:
Thank you
how to use blockproc for dividing the 256x256 matrix into 3x3 matrix with overlapping,kindly help

### Rik (view profile)

on 23 Oct 2019

The blockproc function works on distinct blocks. If you want a sliding window operation you need to use a function like nlfilter.
fun=@(x) max(x(:));
B=nlfilter(A,[3 3],fun);
%show input and output
figure(1),clf(1)%only use clf during debugging
subplot(1,2,1)
imshow(A)
title('original')
subplot(1,2,2)
imshow(B)
title('filtered')
The function can be as complicated as you want it to be.

Rik

### Rik (view profile)

on 27 Oct 2019
Comment posted as answer by parvatham vijay:
what is function @(x), i couldn't get idea,pl.explain how to use function
Thank you
Rik

on 27 Oct 2019

### parvatham vijay (view profile)

on 1 Nov 2019

i want to create a matrix which contains the numbers from 1 to 256, (3x3 matrix but continiously,)
3 rows and 768 columns.the matrix is a repeated matrix ,here 2nd and third column repeated
then 3rd and 4th column repeated.(1,1 1,2 represents first row ,first column element ;like wise)
1,1 1,2 1,3 1,2 1,3 1,4 1,3 1,4 1,5 ...etc
2,1 2,2 2,3 2,2 2,3 2,4 2,3 2,4 2,5 ....etc
3,1 3,2 3,3 3,2 3,3 3,4 3,3 3,4 3,5 ....etc
i tried this code but i cant get this answer
clear all
close all
a= [1:10];
for i=2:4
j=2:4
a(i,:)=a(i-1,:)+3;
end
this is sample i have taken 1 to 10 numbers
Kindly help

Rik

on 1 Nov 2019