how to divide an image into blocks

an image shoud be divided into several blocks of 8 by 8 pixel

[ROSE MARY KATIKALA]

1. Read the image.
2. Image is divided in to sub-blocks of size M x N
3. For each sub block, standard deviation is calculated to increase intensity of image object.
4. Global threshold is applied for each sub block which has standard deviation as greater than one.
5. The above process is repeated for each and every sub block of entire image.

Help me out for this.

[Image Analyst]

You never ran my demos I attached below, did you?

[ROSE MARY KATIKALA]

done but for road detection project i just need to make an image of 0's n 1's of roaads and non roads parts... how can i do that? can u give me a clear explanation.. im beginner in matlab so..

[Walter Roberson]

You should open a new question for that, showing some sample images, and showing the work you have done.

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

Answer 1

[Anushka]

J = imresize(M1, [256 256]);
[r c]=size(J);
bs=32; % Block Size (32x32)
nob=64 % Total number of 32x32 Blocks
% Dividing the image into 32x32 Blocks
kk=0;
l=0;
[F]=zeros(1,64);
%[B0]=zeros(32,32);
for i=1:(r/bs)
  for j=1:(c/bs)    
    B0=J((bs*(i-1)+1:bs*(i-1)+bs),(bs*(j-1)+1:bs*(j-1)+bs),3);      
  end
  kk=kk+(r/bs);
end
% And to get the RGB values I used the following code
for x=1:32
  for y=1:32
    R=B0(x,y,1);
    G=B0(x,y,2);
    B=B0(x,y,3);  
  end
end

Answer 2

[Image Analyst]

See my attached demos that demonstrate several ways to use blockproc().

[Image Analyst]

Also see the FAQ:

http://matlab.wikia.com/wiki/FAQ#How_do_I_split_an_image_into_non-overlapping_blocks.3F