# i split the image pixels into many small matrices

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parvatham vijay on 23 Oct 2019
Commented: Rik on 1 Nov 2019
i split the image pixels into many small overlapping matrices
block(:,:,kk+j)=grey_img((i:i+2),(j:j+2))
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Rik 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 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.
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Rik on 27 Oct 2019

parvatham vijay 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