How i can save all image after cropped in ciclo for?

Hello,

I want save all the image cropped , but the image overwrites.

A=imread('peppers.png');

H=384;
W=512;
size=32;
% crop=zeros(32,32);
for i=1:size:H
for j = 1:size:W
crop = A(i:i+size-1,j:j+size-1,:);
save
end
end

Can i resolve this problem?

[Rik]

Of course it overwrites. You don't use your loop indices anywhere after the cropping. You will need to generate a file name that is based on i and j.

You may want to consider storing the images as image files, instead of a mat file. I would also suggest using a different variable name, as size is a basic Matlab function, so shadowing it is not a smart move.

It also looks like you could benefit from using the blockproc function instead.

Answer 1

[Image Analyst]

Try (untested):

rgbImage = imread('peppers.png');
[rows, columns, numberOfColorChannels] = size(rgbImage);
sizeStep = 32;
for col = 1 : sizeStep : columns
    for row = 1 : sizeStep : rows
        croppedImage = A(row:row+sizeStep-1, col:col+sizeStep-1,:);
        imshow(croppedImage); % Show it.
        drawnow;
        % Construct filename.
        baseFileName = sprintf('Row %d, Col %d.png', row, col);
        fullFileName = fullfile(pwd, baseFileName);
        fprintf('Saving %s\n', fullFileName);
        % Save to the drive in the current folder.
        imwrite(croppedImage, fullFileName);
    end
end

Don't use size as the name of a variable since it's the name of a built-in function.

[Pasquale Giordano]

Thanks, the script is that i want.

Thanks for the advice. Can you help me set up the game save by using indexes. I have difficulty making this setting.

[Image Analyst]

Not sure what you mean. What game? What setting?