Sliding patches of an image

I have create a loop to crop an image to non overlapping patches.

Now i must change my code to create overlapping patches with step half of the x dimension of the patch

How can i do it?

[rows columns numberOfColorBands] = size(Image);
count=1;
for row=1:patch_row:rows %% patch_row and patch_col are the dimension of the patches
    for col=1:patch_col:columns    
            patch{count}=Image_reshaped(row:row+patch_row-1,col:col+patch_col-1,:);
            caption = sprintf('%s_%d.png',name,count);          
            count=count+1;
       
    end
end

end

[Rik]

The solution seems easy: divide the step size by two, but not the width. How would you implement that?

[DIMITRIOS THEODOROPOULOS]

doesnt work

count=1;
for row=1:patch_row*0.5:rows
    for col=1:patch_col:columns
        
            
            patch{count}=Image_reshaped(row:row+patch_row-1,col:col+patch_col-1,:);
            caption = sprintf('%s_%d.png',name,count);
%             imwrite(patch{count},fullfile('C:\Users\User\Desktop\test',caption))
            
            count=count+1;
       
    end
end

end

[Rik]

Then you need to change your code.

If you want help, make it easy to be helped. Mention the entire error message. Make sure we can run your code.

For now my guesstimate is that you have an odd patch size and you forgot to round your indices.

[DIMITRIOS THEODOROPOULOS]

I am sorry!I am new tto all this..this is the code for a simple image of 1696x2544x3.

Here is the msg:

Index exceeds matrix dimensions.

Error in test_slide (line 29)

patch{count}=Image_reshaped(row:row+patch_row-1,col:col+patch_col-1,:);

clc;
clear all;

image=imread('C:\Users\User\Desktop\e-Optha_big\C0001273.png');

patch_row=32;
patch_col=32;

x=size(image,1);
y=size(image,2);

X=fix(x/patch_row);%nnumber if blocks in x
Y=fix(y/patch_col);%nnumber if blocks in y 

Image_reshaped=imresize(image,[X*patch_row,Y*patch_col]);
[rows columns numberOfColorBands] = size(Image_reshaped);

% disp(size(image))
% disp(size(Image_reshaped))

count=1;
for row=1:patch_row*0.5:rows
    for col=1:patch_col:columns
        
            
            patch{count}=Image_reshaped(row:row+patch_row-1,col:col+patch_col-1,:);
          
            count=count+1;
       
    end
end

[Rik]

row=1:patch_row*0.5:rows;
row(end) %returns 1681
row(end)+patch_row-1 %returns 1712

Your last iteration will attempt to access a whole width, while there is only half a width left.

I would suggest you change your strategy and use indices as your loop variable, and then construct the row and column indices from those loop indices. That will also allow you to store patch properly.