patch extraction of an image

i dont know iwhether my code is right for extraction of patch from the right side of an image.

Here is the code:

figure;
[rowsl, columnsl]=size(iml);
blockSizeR=10;
blockSizeC=10;
% [rowsl, columns1]=size(iml);
%  for row = 1 : blockSizeR : rowsl
%   for col = 1 : blockSizeC : columns1
%       patch(:)= iml(:,columnsl:columnsl-blockSizeC);
%       imshow(patch);
%   end 
%   end% 

[KALYAN ACHARJYA]

Please share the image, also explain the question clearly.

[Pravita Lekshmanan]

Sir i need to crop or extract simultaneous patches continuously from top right till bottom left of an image as shown below:

a blocksize of 10x10 like shown below and i need to plot it on a figure as subplots

I dont know how to do the same

Answer 1

[KALYAN ACHARJYA]

im=imread('new.jpeg');
k=1;
[rows colm]=size(im);
for i=1:10:rows-10
  for j=1:10:colm-10
      im_sub=im(i:i+9,j:j+9);
      subplot(round(rows/10),round(colm/10),k),imshow(im_sub);
      k=k+1;
  end 
end

Please note: If you do the same without loop, which is recomended. Also look at Block Processing

You can also save the all blocks in structure and call the individual cell struture in later.

im=imread('new.jpeg');
k=1;
im_sub={ };
[rows colm]=size(im);
for i=1:10:rows-10
  for j=1:10:colm-10
      im_sub{k}=im(i:i+9,j:j+9);
      k=k+1;
  end 
end

Next do the imshow of individual blocks.

[Pravita Lekshmanan]

Thankyou sir somuch it works well for my work.

Really thankful for your answer

[KALYAN ACHARJYA]

@Pravita Happy to know that

Lets Keep Learning!

[Pravita Lekshmanan]

sir if i have need to extract patches from the right side of the image

Columns wise how should i change the above code?

Sir could you please spare me and explain it

[KALYAN ACHARJYA]

j=colm:-10:11

[Pravita Lekshmanan]

sir when i run my code for columnsI=173, it says

for i = 1 : 50 : rowsI-50

for j = columnsI : -50 : 51

im_subL=I(i:i+49,j:j+49);

im_subR=imr(i:i+49,j:j+49);

Index in position 2 exceeds array bounds (must not exceed 173).

Error in new (line 115)

im_subL=I(i:i+49,j:j+49);

why is it so could you please tell me