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i split the image pixels into many small matrices

Asked by parvatham vijay on 23 Oct 2019
Latest activity Commented on by 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))
i want to recombine this overlapping matrices how please help

  2 Comments

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

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2 Answers

Answer by Rik
on 23 Oct 2019
 Accepted Answer

The blockproc function works on distinct blocks. If you want a sliding window operation you need to use a function like nlfilter.
A = imread('cameraman.tif');%load an included 256x256 example image
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.

  2 Comments

Comment posted as answer by parvatham vijay:
what is function @(x), i couldn't get idea,pl.explain how to use function
Thank you
See this link.

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Answer by 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

  1 Comment

Please stop posting your comments (or questions) as answer. Also, your question is unformatted, making it difficult to understand. Please use the layout tools to make your question more readable.

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